Nothing wrong with the mentality the coach needs the right tools to get results. Pep, Conte, Klopp.
We are not saying they have to get their own team BUT they need the right profile and if there's currently no players that fit that, then you buy a lot and hope a few youngsters can supplement that.
We have not done a proper rebuild/clear-out/whatever you want to call it. Look at our team from the Everton loss 3 years ago and don't be under any illusion - talking about change and actually doing it are two different things.
As for making our players tick, we know that. It's social media, shitty adoration when they play against farmers for England and non-football accolades from the Queen. Seriously, you cannot man-manage people who are not even trying or sticking to a professional standard.
The mentality is extremely wrong, the simple fact that you are using a timeline that starts in 2019 as the base for your point about a clear out is at best dubious. But we can do it if you want:
The 4-0 against Everton had as starting eleven: De Gea, Lindelof, Smalling, Jones, Dalot, Pogba, Fred, Rashford, Lukaku, Martial.
The 1-0 againt Everton had as starting eleven: De Gea,
AWB, Lindelof,
Maguire,
Telles, Fred, Matic,
Sancho,
Fernandes,
Ronaldo.
So the difference between the two teams is 6 different players in other words more than 50% of the starting eleven and in theory it should be seven since Varane is a starter. In reality this team has had a massive turnover, we always have a massive turnover, it's one of the few constants since 2013 the managers and the board try to buy success through the market instead of expecting even the smallest of contribution from the coaching staff. The players that are in bold represent around 320m so the club bought a lot since that game with nothing to show for.
Now I need to understand something, the club bought a lot, they bought players that had no issue being managed in their previous clubs, so are we suggesting that these players become unteachable, unmanageable the moment they sign a contract for United? Your post is an other example of how Manchester United managers have no accountability and no expectations, I don't doubt that some players need to leave for a variety of reasons but the main issue at United has been the complete lack of quality of the coaching staffs.