It has a role for sure.
The formation we plays, 4-3-3, is dependent on having width players to get the ball down the flank and create to the striker thanks to the non existent of a number 10. Striker needs to do the holdup play and wingers need to occupy width to compensate for that If you're having such a terrible players on the width, or having strikers or number 10s shoehorned there, plus a striker terrible in holding up the ball, more often than not it won't work.
He needs to change to a system that suits the best of most of the players. He can get more of them with some tweaks.