My guess is that it's based on the bad mix of United offering too much freedom to their managers and United having the means to purchase players from nearly any club. I could be wrong but to me it would be natural for anyone in that situation to consider the idea of executing thoughts that you wouldn't be able to do anywhere else, you have the means to be uncompromising until someone forces you to compromise.That’s an excellent point in your first paragraph. I guess what perplexes about ten Hag is switching from something workable with the players at hand to a system that dooms them, and him whilst making us so exposed, it’s become a national talking point.
The second paragraph has one wonder why.
Think about this LVG stated that he believed that United could purchase any player he wanted. That statement has somewhat been brushed under the carpet because people wanted to have a pop at the club but that's one of the daftest and stupidest mindset that you can have, not only because it's removed from reality but also because it tells you that the manager believed that he wasn't going to have make any backup plans or concessions. It's crazy to think it and it's even crazier to state it publicly.
Paradoxically, United needs to be even more stringent than most clubs in spite of having massive revenues and the ability to waste money and time because managers are clearly willing to waste money and time if you don't control them tightly. It's an other thing that SAF or Wenger were absolutely amazing about.