Sometimes we tend to know more than coaches doing jobs they've become professionals. Erik ten Hag has nothing to do with Manchester United going under, it was due to their terrible performance that they were not able to do better. When Erik ten Hag left, and the slot was open, Ruud van Nistelrooy coached for about 3 seasons, and they never lost a game in that window, Amorim came in and couldn't do the job properly, Manchester United is big club and needs a big mind with a good team, so far this is what they are missing
I also agree, it is not fair to only say ETH is the cause of Manchester United's bankruptcy, he came when the team was already in a bad situation, but he also contributed to the failure. Because for several seasons he was there and there were no results that he could provide. Yes he could get the FA Cup but in my opinion it was nothing more than luck.
Management should be the first to blame, because they are the ones who should know the problem very well and should solve it quickly, but in fact they did not do that.
I almost believed you made a mistake in your comment when I saw you wrote ETH, I was thinking you meant ETH - as in ethereum (the cryptocurrency), it took me about half a minute to figure out that the ETH is wrote was just an abbreviation for Erik Ten Hag 😁
Anyways, Manchester united's problem is not really about coaching, Its more of a managemental problem, though the coach can't be left out since he is also part of the management of the club, but it's completely wrong for us to always accuse the coach only for not doing enough when he has bosses he also answers to, and we can't completely rule out that possibility that the coach might as well be taking orders from above and only doing what the management asked him to do.