Don't know what United are waiting for. Mourinho has to be fired. He's putting a cap on the team's potential. Paul Pogba and Anthony Martial are completely alienated, and for good reason, their talents are being wasted with Mourinho's approach to the game.
There's no reason for a team with Romelu Lukaku, Alexis Sanchez, Anthony Martial, Marcus Rashford, Jesse Lingard and Paul Pogba to play such a conservative brand of football. Every other team in the Big 6 have managers that prefer attacking football.
It'd be one thing if United had the personnel to play defensive football, but they don't.