Why is it stupid though? I think there are a couple of basic facts we all can agree on
1. The job carries immense pressure to deliver. Both from the fans, but also because the media LOVES to blow it up and write negative "scandal" pieces about us when we do badly
And you don't think the Madrid, Bayern, Barcelona and Juventus jobs have immense pressure attached to them? You can get sacked at either of those clubs for not even doing anything wrong. You can get sacked simply for the fact a rival had an incredible season. Ancelottti got sacked at Madrid because Barcelona won a treble - that was enough to get him sacked. You're constantly scrutinised at those clubs before you even take charge of your first game - there's none of the whole give managers time bullshit, because the fans aren't stupid enough to fall for it.
2. Ed and the board are incompetent and the structure at the club is outdated. There is ample evidence that we are a badly run club from the top
Yet that incompetent structure keeps managers in jobs far longer than they would be at any other club. In terms of expectations, it's a piss easy job. As long as you get top 4, you are in no danger of getting sacked. The same incompetent structure let's you hide behind the fact you haven't signed the entire squad of players, so you can't be expected to achieve anything.
3. We now have 3 (soon to be 4?) managers who have raked over the coals both by the press and by the club and had their reputation take a big hit because they apparently failed to meet expectations.
And in that time :
Real Madrid - 6 managers.
Barcelona - 5 managers.
Bayern Munich - 5 managers.
Chelsea - 5 managers.
Yet if you're afraid not having enough time to do your job, you'd be afraid of the Man Utd job. What a load of horseshit.
So its a difficult job with loads of pressure. If you fail at it you risk getting your reputation ruined. Compare this to say PSG, Bayern, Real or Barca where you almost can sleepwalk yourself to the title or a club a tier below where you will get plenty of plaudits for just getting CL football. A new manager needs bollocks, big ones, because this is not a job for the faint-hearted.
Oh yeah Moyes, Van Gaal, Mourinho and Ole were really on an upward career trajectory up until they got here. Like I said, our fans seem to think this is some high pressure job. It's not, you're expected to actually deliver and compete at the highest level in a high pressure. Our managers aren't expected to do it, despite spending a feckload of money.
Mourinho might have actually got himself killed somewhere like Madrid if he was allowed to treat the club with complete disdain as he was repeatedly allowed to do here in his last year in charge.