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Re:Flask 2.0 by ehsankia on Wednesday May 12, 2021 @04:05PM (#27134509)
Considering the last item in the changelog is:

- Add type hinting. https://github.com/pallets/flask/pull/3973

I think it's fair to assume annotations is the big reason.

Re:Flask 2.0 by detaro on Wednesday May 12, 2021 @04:18PM (#27134646)
Annotations were added in 3.5, so no reason to drop 3.5 for them, and 3.5 support had been dropped from Flask over a year ago.