You lose something if you play De Jong anywhere that isn't DM.
His unique skillset means he's great at playing forward passes from deep, and he's also great at making progressive runs from deep.
I used to think this but Koeman played him more box to box last season and he was absolutely incredible. His understanding of space and timing that you see in his passing carries through to making runs into the box and he scored some great goals and was a real threat.