When a club is performing poorly, the first person to be blamed is the coach, because he is in control of the players. If a particular player is performing poorly, then he should be replaced, but if the coach doesn’t do that, then at the end he will be blamed. There are some players that we know are not really ready to play for the club, I don’t know why Ten Hag keeps on making use of them when you have better options on the bench.
Any player that’s not in form, then make use of another player. I don’t know why Ten Hag is still making use of Rashford when it’s obvious the guy has not been in form since last season, but Ten Hag keeps on making use of him in almost all matches, which he does end up performing poorly.
Not many coaches/managers have the ability to understand their team well, where he have to rotate players or decide to replace core players when they are not performing optimally, and coaches/managers like that are expensive, that's why only big clubs can hire them and also that's why only strong teams end up becoming champions repeatedly, and also the greatness of a coach/manager must be supported by the strength of the club in providing funds for the manager to hold or buy players who are considered to be able to make the team stronger.
And Ten Haag looked pretty bad at Manchester United after his first season which was better but after that United did not perform as they should and Rashford is a player who can be said to be bad in that team because he is not a stable player, not only when Ten Hag was at United but previously we have seen how Rashford did not perform like the best player.