Some people call them "jangle pop" instead of "power pop", it seems, but that distinction seems unhelpfully nitpicky to me.
Yeah, I absolutely do not see Let It Be as post-punk, even accepting the catch-all nature of that term. It's one step away from Springsteen. I think you could probably have a college/alternative category with them and REM, Pixies, probably others I'm failing to think of.
Red and 1989 are fine picks for Swift, but both are inconsistent (Red hilariously so - the first eight songs are all killers and the last eight are all mediocre). But I would consider swapping one for Fearless on any list since a) it's the album that made her huge, and b) it reflects her country origins, whereas 1989 sounds a fair bit like much of the stuff on Red and so having both is a bit redundant.