Tiresome Tropes: Tearing Down the Old to Make Way for the New

Well, it's been a while since I've made a 'Tiresome Tropes' post. I'm not sure if TVTropes has a term for this, but I'll just label this as a Tiresome Trope anyway.

I'm not a fan of the writing decision to tear down preexisting characters in a sequel or spinoff of the series that they starred in. I'm sure that very often this isn't done intentionally, that the writers were trying to make the characters more three-dimensional or interesting by making them more flawed. But regardless of the writers' intentions, I still don't like it.

[Below the cut are spoilers for "Batman Beyond," "Harry Potter and the Cursed Child," and the Star Wars sequels]

( A.K.A. Why I Often Turn to Fanfiction )