I’ll be honest, I think it’s ridiculous that a referee can blow the whistle and things after that can still count. Makes no sense to me.
It was a necessary compromise. There were too many plays where the refs incorrectly blew the whistle, and it prevented the play from counting.
I could be wrong, but I think it's an exception for certain calls, and requires obvious evidence. It allows for certain critical plays to stand.
If all NFL players made it a habit of having the closest player grab the ball "after" every play, then the refs wouldn't play as big a role. The only thing that makes the play unfair in any way is that after a whistle blows some/most/all players stop playing, so it's weird to count the play after the whistle. However, if a ram had grabbed the ball out of habit then the 2pt wouldn't have counted.
These are professional players, and they don't have a professional attitude. Closest player grabs the ball on *every* play. Chew out players in the film room who don't do it. Problem solved from both sides of the ball.