I’m confused why you would think it would be easier. I think it would be the opposite and harder if you are sharing the child 50/50.
It’s harder to move out of state than it used to be. The more custody time the other parent has, it seems the harder it is. From my understanding, his ex will have to prove the worth of the move and in a 50/50 custody arrangment it would be hard to show it’s in the best interest of the child.
If she tries to move, you can petition the court.