Obviously they can't get rid of the formation switches as this is part of the real game and makes fifa more tactical. What they should do, and I have no idea why they haven't implemented this already, is to give players the chemistry that they would have had if they started in that position. So if you're switching formation and playing Dembele at CAM, then he should have 2/3 chem. If he's playing at LW then he should have 6 chem. It's the obvious solution and it would stop formation switches at the start because it would give them the same chemistry as starting them there. It's stupid that a player like Dembele, who's played exclusively as a winger throughout his career, can get 10 chem at CAM or Striker.
I don't mind so much Messi at CAM, since he can play there. This can be corrected by adding secondary/preffered positions in ultimate team. Where he can play as either a CAM or RW and still have the same chemistry.
Position modifiers to be scrapped