I agree with the post you quoted.
I'll give you my reason. The players and fans.
The cycle.
New manager comes in, everyone is excited, fans and players alike, the fans know it'll take time and say they will give it.
The players all of a sudden find there football ability, Rashford starts scoring for fun again. New players are signed and they start well.
First full season, we finish top 4 and/or win a trophy everyone is happy.
We sign a few more players
2nd season, we've an average start, Rashford has only score 1 in 10. The football isn't as good and some of the signings that done well last season aren't performing to the same level. By Halloween the first murmers by some quarters of our support start questioning is this manager good enough. By March we still haven't had a meaningful patch of good form, Rashford is up to 4 goals in the league. We are now approaching half the fan base losing there patience with the manager.
End of the season, we finish 5-8 and possibly a trophy, a. Sizable amount of fans want the manager out
3rd season, more players signed, the season starts poorly, the manager is sacked before the lights on the tree are turned on.
This sort of situation happened to Jose, Ole and ETH.
Each time the players absolved of blame.
The fans promise to back the manager, but as soon as things look bad they want the manager out and put big pressure on. The next manager comes in and after the initial bounce we get the same results in a never ending cycle.
The players though, get away Scott free again.
The mentality around this club is all sorts of wrong and I hope this time the manager (or headcoach) gets time and patience needed to change things even if it means going through another rough season or two to do it.
We can't undo 11 years of bad stewardship/mentality in 1 or 2 seasons.