It is clear that in the end Manchester United could reverse Chelsea's previous situation and even though they finished below Chelsea, they won the title and also had slightly better European competition. I think both teams should recover next season and regarding the polemic about changing coaches between the two, it will definitely take a long time to build everything from scratch.
The only bright point about Manchester United this season is the FA Cup title. Otherwise negative points pass largely non existent positive ones.
The new coach has certainly a lot to do and hopefully the team will recover after getting rides from useless players and recruit some serious ones.
From what I read in media, there is players that will most likely remain with the team which are Mainoo, Garnacho, Hojlund and Onana. Fernandes might move to Bayern Munich at the time Tuchel could go the other way to train Manchester United instead of Bayern Munich.
Even though they realize that getting good performance takes time, but in reality they often change coaches. But what doesn't make sense is, when in his first season the coach failed to produce good results for the team, but they would quickly fire their coach. After all, if they realize that forming a team takes a long time, especially as a new coach also takes time, then they should also retain their coach. But anyway, what Chelsea has done seems to be that in the last few seasons Chelsea has always had a new coach every season, it's a choice that has become a joke I guess.