Leicester was an anomaly, outlier. However, their system was really good and made their player look better than they really are. And that's the way it should be. Build a system and fit players into it.If they get the players they are supposed to be going for there will be the midfielders the season hasn't started yet and until it has we do not know as supporters how it's going to pan out. It's a shame Yoro and Hojlund have got injured (Yoro is a bigger concern) but there are still players (admittedly not world class but Leicester City proved you don't have to be world class to win things) who can make a difference.
It is not sustainable to spend big money on every position and it is not healthy. Sign of a great manager/coach is moulding average players to shine in his system.
However, United is lacking personnel, bodies. Eriksen is not defensive minded, Bruno even less, Mount is good in high press, Mainoo is decent at best, as well as McTominay. Midfield is paper thin and I hope EtH get some help there.