Bournemouth performed very well and was able to take advantage of every weakness of Manchester United with the right strategy, I admit that against the red devils squad, Bournemouth was better prepared than Manchester United, but surely you know that the English league is a very competitive league, so the team that is not ready will certainly get the consequences (defeat) in a match, so I think it's not a good reason for us to say as the cause of the bad results achieved by Manchester in the match.
Indeed, perfect teams in the English league so far, but compared from manchester city, I actually see that manchester united has the worst problem, manchester city has a bad defence after losing Rodri but they still have an impressive and sharp attacking line in my opinion, while manchester united precisely they have many weaknesses in every line.
We have few clubs which are usually staying in middle or lower ranks are increasing their depth and doing amazing job specially clubs like Nottingham, Bournemouth and Fulham at their peak due to their consistency and skilled players but on other side we have clubs like Manchester United and Newcastle United which spend huge funds on players but sadly still not able to bring expected results which is clearly indicating how things are taking changes and just having big players and spending huge funds not helping for winning games and titles.
Manchester United is currently most talked team in Premier League due to their worst performance and having quality players their problem is not new because we all know after retirement of Sir Alex Ferguson we have no coach able to do things like he was doing now we have some chances of improvement through Ruben Amorim, but It's also looking no easy because he's going to take time then we can expect positive results.