Forget the dreams of Zidane at Manchester United already! By the way, I am not at all sure that even Zidane and Zidane will cope with the current state of affairs. It is precisely Pochettino's style of team management that suits Manchester United, because in this Manchester United is like Tottenham, not Paris Saint-Germain. If Zidane for me is a master who knows how to turn a disparate group of stars with their mutually exclusive ambitions into a single team that will make the result itself, then Pochettino was famous for his ability to put a team game from the available players. Also, unfortunately, Pochettino is not an indisputable authority for the stars of Paris Saint-Germain, which Zidane could become.
Not all successful coaches can achieve good results in a short time, and I think the problem with Manchester United is not giving the coaches enough time. Look at how patient Liverpool was with Klopp. I am afraid with the current trend at United, even the likes of Zidane or Pochettino may just end up getting sacked.
It is true that big teams carry risks in this sense. Manchester United is a team that has achieved great success. They are looking for the successes of the old days. The fans also want to watch the old Manchester United game as soon as possible. This reduces the patience of the technical team. If Solksjaer had been given enough time, maybe he could have gotten into a better formation. It would be delusional to expect success all at once. No matter how good your staff quality is, unity and harmony are very important.