I assume that during a point where Stephen and Christine would have broke off like in the MCU, she decided to continue instead, and that lead to her eventually being in the accident that killed her.
Yeah, but that's the point -- in the first couple of episodes, we were shown the specific moment of decision that caused the change, but here it's more vague and we're left with assumption and conjecture. And it's not a simple decision like Peggy choosing which room to be in or Yondu deciding to give a job to his underlings rather than doing it himself. A lot would've probably gone into Christine's decision whether or not to break it off with Strange. It wouldn't have been a momentary whim. And it would've probably been in
response to something, some difference in Strange's own behavior, rather than just the flip of a coin. That's the hangup for me. He was such a total jerk in the movie that it seems the change would've had to be much further back in his life and much more major in order for him to be someone she was willing to stay with.
I'm realizing this just compounds the problems with how this episode treats Christine. She's reduced to an object with no agency and personality, a cosmically designated victim whose only purpose is to die to motivate the male lead, and more than that, there's no thought given to her own decisions or thought processes, to the question of
why she would stay with him instead of breaking up with him. The writer has no interest in her as a person with a mind of her own. Even though her decision is the pivotal one behind the divergence, the reasons for it are totally ignored. It just doesn't work.
Granted, in episode 3, we didn't get any explanation for why Hope became a SHIELD agent there when she didn't in the original continuity. But I can excuse that because the cause of the divergence was kept a mystery until the end, and because it's in character that Hope would be willing to do that kind of work if she was given the chance. (Come to think of it, though, she was also killed off to motivate a male character. I don't want that to become a trend. Let's hope they used up all their fridges for the rest of the season on Christine.)