That's not actually a reasonable representation of the argument though is it? In fact it's borderline bad faith. Ten Hag isn't at Chelsea, he doesn't have Pochettino's track record of abject failure or Tuchel's history of causing chaos. I wouldn't need to be clamouring for him to reluctantly have him at the front of the queue of a list of awful names. Ten Hag had a record before United (including his first season at United) which made him a high potential candidate who could have had multiple upsides. None of the proposed candidates have that. I'm not interested in paying £6m to sack Ten Hag, pay another £5m to bring in Poch, then pay another £10m to sack him in 18 months time when it turns out "slightly better than EtH's worst season" isn't good enough either. That's £20m we could be spending on a player, or a stadium, or a training ground.
None of the candidates have even close to a record which suggests they would be good United managers, EtH at least has the possibility that he might stop being a stubborn arse and play a sensible system he can obviously coach well. And my biggest objection to him was his eye for a player, if INEOS are actually doing their job that's no longer an issue. No matter where EtH managed this season, if that was the list of options I'd still have him above the others.
Like I said, it's head in the sand, grass is always greener, disingenuous nonsense that just because EtH deserves to be sacked for his performance this season we absolutely should do it regardless of who else we get in to replace him. EtH can deserve to be sacked, he can still also be the best of the people who can realistically get.
Put it this way, EtH started at a 7 based on his work at Ajax, went up to an 8 after least season and is probably about a 5.5/10 prospect now after this farcical season. A 5.5 is well within the range of "deserves to be sacked" IF there is someone better. But it's not a trigger, if there's no manager better than a 5 out there who we can actually get then getting rid of him is a totally emotive decision based on a desire to punish failure rather than do what is best for the club.