I disagree with it a lot. Just because United is a club that is mismanaged, doesn't mean that ETH is a good coach, he is not a good coach neither. Both things can be true at the same time, we are seeing both United being managed very badly so far, well this season things could change to be fair with Jim Ratcliffe, but so far it has been Glazers and it has been managed improperly and that is why they were bad, but also we have seen ETH be a terrible coach too, Ole wasn't good too. Last time they had a decent coach was when they had Mourinho if you ask me, after that they never had a decent one.
If you have Jim do what he knows what he can do, and if you hire a great manager, like Pep or Ancelotti (not saying get them, they can't, just saying someone good) then you will see the difference in the team. I personally believe that the best thing that they can hope for right now is ETH learning how to manage stars, because he has absolutely no idea so far.
I don't even see the Manchester United as been mismanaged but the entire club are resting their failures over the hands of a man like there is no alternative person that can do this job better. Remove Pep and Anceloti for now, they also had their own worst moments in a football and the reason why they are topping today isn't because they are exceptional but because there is no other coach that can strategically beat there ways of playing but if we look around, they are sitting around somewhere that can do that job well done.
The first approach for a good season for Manchester United is letting Erik go but they have consider/considering a second chance and it's going to be 3 season wasted before they realized that Erik was not fit for the game. If they can hire someone like Maresca, it will do them some good. I have not seeing with Chelsea squad in action but the decision of buying players have been convincing that we are going to have a great season With Chelsea this season.