That Whitwell piece illustrates the points quite a few on here have been at pains at making: he was hired to transform the playing style of the team (and the small matter of the culture) and then he was not supported enough in getting rid of those who could not hack it tactically. That he was actively undermined by players on the pitch with such an injury list that he could not take them out of the team highlights perfectly how disastrous the season was.
Then when the club fails to sell the players who had been publicly hung out to dry last summer, he has to deal with the shit and when he persists with his long-term approach Fletcher and McClaren advocate a short-term pragmatic fix (which is what we've been doing ever since Fergie retired), which is focusing purely on the season at hand at the cost of future progression.
The gaping hole midfield is explained here by players undermining the manager's instructions. And when he wanted Rice, they bought him Casemiro, and the following summer he wanted him again and they got him Mount. Sure, he made a major mistake with Antony, but this club has been an utter disaster in how it's been run.
Anyone incapable of playing a high line defense should be off (bar Evans, as I think he has value in the dressing room, fully behind the manager, puts his body on the line, and will be paid quite a modest wage, eventually morphing into a coach I suspect), i.e. Maguire, Lindelof. Those not technically at the requisite level also need to be off, that's AWB, though McTominay may stay purely for the tactical plan C option (a good offer would be impossible to reject though). Those not willing to play their part in the high press also need scrapping, so that's Rashford. And then we have players who are clearly past it, like Eriksen, never going to fit, like Donny, likely past it and also not behind the manager, like Casemiro.
I've felt this repeatedly over the last few summers, and I have the same stance now, I am more concerned with getting players out the door than whom we buy. It is the long-term approach that suffers when we carry all these ill-fitting (for different reasons) players and it is the #1 stumbling block to fixing the culture.