You're being far too simplistic. A team is about balance. Its fine to have a Pogba if the rest of the team makes up for it with hard work and covering him defensively. But you should probably only have 1 player like that at the best of times.
Barcelona, City and Ajax for example all have their forward players pressing and closing down which Pogba doesnt always do. Some games he does fine, others he's only interested when we have the ball and tracks back like hes a striker.
In our team this season with Ander and Matic, we can get away with having a "midfielder" who isnt defending much at all most of the time. But in a big match against the best teams its possible that not having a 3rd midfielder to defend against an opposition's 3 man midfield can cost us. If they move the ball quickly away from Ander and Matic's players to a free player because Pogba isnt back.
But the main problem is, Ander makes that midfield work and it seems like he wont be staying. So we're going to have to find another extreme hard worker with a combative style to replace him so we're fine with Pogba in attack.
If you want to call that player a donkey, so be it. But thats what counterbalances Pogba