My thoughts of OP's points:
13. Trump almost flipping Charleston county, SC
I wouldn't quite say he "almost won it", but his performance was still quite surprising to me - I think I overrated the number of "Haley Republicans" that existed in this type of place who would ultimately not vote for Trump.
It's possible that Haley endorsing Trump might've swayed a few that were on the fence to begin with unlike the McCain family's endorsement of Biden which alone may of cost Trump Arizona in 2020. I doubt that South Carolina would've flipped, but at best it could've prevented it from moving as far to the right as it did (I'm skeptical to say that it could've moved left given how Trump improved in every state).