Everyone who has come from a ALPA regional pretty much all say this as well. The truth is that each carrier is unique in its employee/labor relations and profitability. Those things have more to do with how pilots’ experiences are at their previous airline than anything else. Also, pilots don’t really understand the ALPA structure where each airline MEC is independent when it comes to local contract and general labor relation matters. So you are probably right. But once you are at one of the big 6, it’s also about strength in numbers when it comes to affecting policy at the government level.