Due to injuries, the recent 11s have been far from what he would want to be picking. So your point ignores that several guaranteed starters have been unavailable to him for large parts of the season. Shaw, Martinez, Varane and AWB would be his starting back 4 and they started only two matches (and Martinez went of at HT in the second match then Shaw got injured long term).
Pre-season he was going for a Mount, Mainoo and Bruno midfield then lost Mainoo in the Madrid game after 2 minutes and he's not been seen since. Amad was due to be given a chance... got injured after about ten minutes, not been seen since. Amrabat was signed far too late after having zero pre-season. Instead of a player like Kim Min Jae.... we get Johnny Evans because the club is a billion in debt, the majority of which is the original debt put on the club by Uncle Malcolm in 2005. Hojlund looks a good signing... signed very late and came in injured... his injury is still being managed even now. People boo when gets subbed, but it's for medical reasons to try and ensure he doesn't get a permanent injury. Then there's the Greenwood debacle. The club higher ups thought they could bring him back and it would be like a new signing.... lolz
Casemiro was one of the best players last season and has missed half the games injured. Antony has been 'unavailable' for non-football reasons, Sancho has been a disgrace and is unavailable because he wouldn't do what he was told in training, regularly turned up late, won't accept anything is his fault all despite being paid 275k per week to be a 'professional' footballer
In all of this I am not saying Ten Hag in or out.. just that I do not see how any manager can be at their best set against all of that bollox, much of which is not of his making.