So, by your logic in order to fix the antennae problem we have to put something ON the phone and to fix the proximity sensor problem we have to take something off?
Fix the damn phone. Period.
If these issues were missing features we thought should be there I would agree that some of this is whining but these are missing features, they are basic functions of a PHONE.
There's nothing wrong with the phone, I reset all settings and it was immediately fixed. And it's been a known issue for screen protectors to sometimes interfere with proximity sensors since the original iPhone. This shouldn't come as a surprise.