User blog comment:MakeShift/Discussion on post-Crisis changes to the wiki/@comment-3221148-20200117221220/@comment-3221148-20200117231556

It actually MAKES MUCH MORE SENSE for Batwoman characters to "continue as they were previously" on an altered Earth.

Why? Because, remember, Batwoman is chronologically "late to the party". The series proper takes place in 2018, since it establishes the ORIGINS of Batwoman, before her appearance in the "Elseworlds" crossover. However, instead of finishing this backstory at the mid-season, they let Alice win, and continued into the new year. So, to bring Batwoman characters up to speed in 2020, a universal rewrite is something that can help do that for the viewers.

Otherwise, there'd be the question of how crazy skilled was Alice to be running from Batwoman the whole 2019 (since she appeared at the start of the crossover in flesh, still an outlaw). Now they can ignore that entirely, and continue with Kate still being a rookie hero in her storyline, while the show is brought chronologically to 2020 (despite that, the Crisis shenanigans obviously made Kate much stronger, but she has already been shown to be an experienced vigilante back in "Elseworlds", so whaddayahave...)