It's only the manager of the club that is saddled with the responsibility of providing the best tactical approach that'll help the team get good results and that's why he's been held accountable when the team is underperforming.
Erik Ten Hag have been very poor with his tactical approaches since the start of the season and it's has really affected the result of Manchester United this season. The club's performance keeps on getting worse instead of improving and if they continue with their current form, they are likely to finish the season half of the season. Erik Ten Hag must as a matter of urgency try and sort out the current issues that's making them to underperform or should be sacked.
From what I see, Erik Ten Hag seems to have run out of ways and tactics to master the game in the Premier League. So, with its current quality, wanting Man United to be truly productive is very difficult. Nothing was suitable or it was Erik Ten Hag himself who forced players who clearly could not meet his criteria as a coach. In my opinion, this season, if Manchester United manages to improve its poor performance, it still won't be able to secure a Champions League ticket next season. There are still many decent clubs this season such as Newcastle/Spurs, Arsenal, Liverpool and Manchester City.