I mean given the fact that the Eagles are a shitty dysfunctional mess, can you blame him for wanting to leave?
If I'm being paid a guaranteed 13 mil a year for being mediocre I deal with it and do my fucking job. Your point makes no sense anyway because his biggest problem is that he knows he won't be an Eagle for much longer.
Due to the old rookie wage scale, Sam has already made plenty of money. Sam probably wants to succeed and prove he's a top tier NFL QB, and considering he's now on his second clusterfuck of a franchise he's probably sick of the bullshit. If they aren't wiling to make him their guy, he wants to go to a team that will. He was likely told he would be the guy, but when a franchise trades that many resources for your replacement, clearly they don't have faith in him.
Let's be honest, the Eagles weren't a QB away from greatness. Trading that many draft resources for a QB when you're fine at the position is asinine. I'd want off that sinking ship too.