Although not overtly stated, I think the fact that Nicolas derailed the attempt for Agatha to steal the power from the last batch of witches is why time ran out for him... 

I thought more Time Bandits than Keyser Sose in the reveal of the room having things we had just seen in the real world.

I liked the callback to the debate if the song was Coven Two or Coven True and why it was Coven Two. 

I wasn't sure Agatha's motivations were clear at the end exactly in terms of deciding to spare Billy and sacrifice herself, but do wonder if the result of Agatha not seeing Death again is why she is in ghost form.

Not sure I believe Lillia is dead, she should not have been able to see the moment she told Agatha about as she could only, as far as we know, jump about her own timeline.

neuters the main villain in a fantastic way for future appearances. Agatha is a murderer hundreds of times over and unrepentant. But now that she's dead she can't kill anymore and is now the sassy sidekick. She's not powerless, but she can be the fun, reformed side character for future appearances. Like Spike or Angel on Buffy (LOVED seeing that poster on his wall). It's a very interesting place to put a charismatic actor you don't want to fully lose in your universe. The wig and the effect needs some work but I really don't hate this. It's satisfying in this story yet leaves the door open for future stories. Something Marvel has really struggled with lately.

Restoring Jen was absolutely rushed. I'm so glad Sasheer got such a good part and played it so well but Agatha being responsible for her binding came outta nowhere - that's not what Agatha does, she just takes and kills. She doesn't toy with her food. I am glad she's back out in the MCU.

I also appreciated the grace note of revisiting Alice's death. Showing Death doing her thing and Alice having that moment of acceptance was actually quite beautiful and powerful.

I do think not showing us Tommy even a little was a little lame. That was unsatisfying and I could have done with ten less minutes of Nicholas if we had gotten a taste of what's actually coming. I was pausing the finale every ten minutes to make sure we still had enough show left to wrap up well. Also, this is such a convoluted way to get Wiccan into the MCU. Wanda could have just been successful in MoM in finding alt universe versions of them - and I like that this retroactively makes her slightly less psychotic because her sons really were out there - but still super convoluted.

Someone pointed out that during Agatha's confrontation with death, all of the coven's gfts were used. I didn't notice them all but it being highlighted really shows how well this show was made.

Agatha tried to create a circle of protection from "evil", Alice's move from episode 4. She tried to heal herself with water from a hose in moonlight, from Jennifer. Lillia's "hit the deck" prophecy helped save her. And when she died, the original Green Witch, Rio, transformed her body to be one with nature. Gather Witches fire, water, earth and air indeed!

Agatha mentioned she sold the binding spell to the person who bound Jen - basically the person who bound Jen was a proxy for Agatha, which is why Agatha was the person Jen needed to unbind her, and Jen never understood how the person had the power to bind her in the first place. Agatha was like a mercenary - not only did she kill witches for their power, she then apparently sold her skills regardless of the cost.

It is why I kind of wished Agatha hadn't sacrificed herself, it seemed out of character. That is twice (WandaVision, Agatha All Along) where the lead was really the bad guy, and the show tries to have its cake and eat it too by handwaving a bit of how bad the actions were by crouching it in personal trauma.

I wonder if, during episode 8, at the point Agatha is left alone in the final trial, is when they should have done the flashback sequence. The flashback I think would have worked great as Agatha's thoughts when she believed she had failed on the road and was about to die, thought about Nicky, and then looked in the locket and saw the dandelion seed - meaning the fact that at the end she was thinking about Nicky and not herself was how she survived the trial, not worrying about not having her power back.

Then episode 9 would have started just after she gets out of the basement, contained the battle, and then the reveal of ghost Agatha. I think they prioritized the reveal about Billy creating the road over the reveal about Nicky and that Wanda never expected the road to happen, and wanted us to think Agatha was dead - but that never seemed likely. I think it would have helped Wanda's motivation in the battle if we knew about Nicky and Rio and that past history first, and if she died mid-episode 9 I might have believed it was going to stick.

On rewatch it may not matter, but I'd have structured differently.

I liked how the flashback was left to the final episode, because one of the central mysteries of the show was who is Teen, are they Nicholas, how did Nicholas die, what happened regarding his death that caused the rift between Rio and Agatha. When we found out that it was he and Agatha that created the Ballad of The Witches Road, but it originally being a positive song about a mother and son's love, it makes the Agatha bastardization of it to kill other witches layered. Knowing that Agatha died in the previous episode was pretty vital to me. Narratively if we found out the truth of the witches road and how Nicky died before the big showdown, I don't think it would have capped off the show nearly as effectively.

It really was Agatha All Along. She created a con that lasted for centuries and had an immense effect on witchcraft as a whole. That's the bookend to the story.

She wanted more time for Nicky and that was the one thing she couldn't give him, but she could grant more time for Billy. Two boys being chased by death.

And I just generally dig stories that subvert the typical finale format.

Death was apparently upset that Billy Maximoff had taken over the dead body of William Kaplan, so she didn't get the body, like the balance was out of whack. Agatha implies she made Nicky "from scratch" do we think that Death was coming for Nicky because he shouldn't have naturally existed in the first place? So part of Agatha's protection of Billy (after he invoked Nicky) was because it was another kid that Death wanted because trhey shouldn't exist per se? (Might be a stretch)

The day Nicky performed The Ballad of The Witches Road in the tavern (the day he would die), Nicky backed out of the plan to lure in the coven for Agatha to drain and kill, and instead ran away. He didn't like her killing Witches to begin with, but as she was his mother, he went along with it. So using their song to do it, didn't sit right with him.

After his death, and through her grief and malice, Agatha then used the Ballad, to kill hundreds of witches for centuries. That was her shame, and why she wanted to remain a ghost. She said to Billy she wouldn't move on because "she can't face him". It seems to her, it was a betrayal of the bond they had and what they created in the song. Despite questioning by Rio when she asked "Why do you let them say those awful things about Nicky" , Agatha already thought what she did concerning Nicky far worse than any of the rumors that circulated, so she didn't correct them. Plus, if she had of corrected them, it would could have ended the scam, and Agatha is still a villainous character who desired power.

I don't think Nicky's existence offended Death, I think it was more to do with the fact he was destined to die in childbirth. She granted Agatha the extra time out of love. She even said that "nobody in history got the special treatment you got". To me, it was the extra time Death granted that a skewed the cosmic balance, not that he existed. And ultimately, Death had to come to collect. Then that echoes Billy and how he's stolen extra time. Billy was a soul created by Wanda and somewhat out of Death's grasp unless he surrendered himself to her. William Kaplan was supposed to die, but now his body is housing Billy (I don't think we ever got confirmation if their souls have merged although it was talked about afew times), he's an anomaly that clonks up the gears of the natural order.

I'm not even going down the rabbit hole about Death being Nicky's mother/father, because I've seen a lot of conversation about that recently.