Even though I also think substitutions were one of the causes of Liverpool's defeat, I can't blame Klopp at all. Because we know that M. Salah is actually still quite susceptible to re-injury. Even in interviews last month or a few weeks ago, we knew that Klopp would try to play their core players more carefully, especially Salah. And maybe Liverpool attach more importance to the Premier League. Although I know Klopp also has ambitions in the FA Cup. But it seems that Klopp also realizes that with so many injured players, Liverpool must save more energy for the Europa League and Premier League matches. But I don't know what is clear, I am also quite disappointed with the results, although I can understand that. Oh yes, Man United seems to be starting to have quite high self-confidence again.
There is no one to blame here and indeed luck was on Manchester United's side so they were able to win the match in the final minutes, I think the substitutions made by Klopp did not affect the team's performance in that match and in my opinion Liverpool's defeat was due to their bad luck and On the other hand, the Manchester United team played a little better even though they were not favorites in this match, but they managed to answer these doubts quite well.
This is a trophy that is possible for Manchester United to win this season, they are very close to the FA final this season because in the semifinals Man United will not meet a tough opponent.