In the span of this year, I’ve had two random apparently MFI certified, but definitely not reputable brand cables stop working on my iPhone and work perfectly fine on my iPad (7th gen).

If you use Quickstart, a lot of settings sync across.

It could scratch the screen underneath of the screen protector overtime. I’d recommend removing the screen protector and putting the other one on after cleaning off the screen thoroughly. Make sure there are no bubbles in the screen protector before you stick it down.