Yes, but all the evidence points to the fact that this dysfunctional setup has also been consistently choosing managers that are past it or not good enough. None of them have shown anything to suggest that they were good enough after leaving United.
INEOS (correctly) started at the top, and Murtough is already gone and EtH is next in line to be replaced. He does not have enough of a track record at the top to treat this season as an abomination, and for all the difficulties he encountered we should have done much better, both in terms of results and performances. Had he made it out of CL groups and was lingering 4-5th in the league with good performances mixed with meh and bad ones, hardly anybody would be calling for his head. But we are 7th, out of easy CL group and have overwhelmingly bad performances. It is not good enough regardless of the structure and squad he inherited.
He has been given considerable say over transfers, basically 100% of fans were behind him and only now we are getting some hints that players are losing faith, whilst until recently they were behind him. He had leeway to get rid of the likes of Ronaldo and Sancho with both club and fans also overwhelmingly behind him. In his first season he had the benefit of Rashford having the best season of his career, relatively few injuries, easy Carabao cup draw etc etc. And we had quite good results but performances were not really impressive for the most part (he was correctly given the benefit of the doubt then).
So whereas many things did get bad for him, he also had things that were good for him/conducive to him doing well. I feel that those who advocate giving him another chance also tend to cherry-pick things that went wrong.
We also have evidence that EtH was not first choice for any of the other top clubs with a better structure, and he did not even impress Spurs. So whereas he was not a bad appointment at the time and deserved to have a chance at higher level, it seems that other clubs judged that he is too much of a risk and maybe also benefitted a lot from one of the strongest generations of players in years and good transfers whilst his coaching may be good but not necessarily highest level in top leagues.
In short, I believe that “wait until we are completely sure the manager is not good enough” approach is flawed (and has been unsuccessfully applied by the old structure). The preponderance of evidence in my view points to EtH being a good coach at lower level/more familiar surroundings but is not good enough at PL level, and even with better structure and improved squad we won’t be close to competing for big trophies under him, so it makes total sense to part ways.
And even if he is a genius and everything could click - if players lose faith there can be only one outcome anyway. We are not replacing the entire squad under any structure.