I don't think, coach is the challenge of Manchester united, because Erik Ten Hag really performed well in my own observation in this premier league competition that just ended few weeks ago, and if more chance can be giving to Erik Ten Hag in the next season, I think he will try more than this next season. I disagree with you by saying Aston villa coach is more talented or better than Manchester united coach, I believe you can still remember the position of Manchester united and Aston villa last two seasons that made Manchester united to ended up in a fourth position and Aston Villa ended up 7th or 10th position. I know Thomas Tuchel is an experience coach that know how to improve a team and I believe he will do well if Manchester united Management want to change Erik Ten Hag, because Thomas Tuchel helped Bayern Munich to get to semi final in the champion league competition in this season.
Coach is not the only challenge for Manchester United. Manchester United needs more players to strengthen their squad, the available players seem like they are not strong enough to continue playing football. In my opinion, we can blame Ten Hag because since he refuses to get young players who can improve their games when other teams are busy signing many players, Manchester United will be talking about one player since the Premier League games ended, they have been planning to sign one right back. I don't know if Manchester United is facing final difficulties that's why they don't want to buy big players.
Ten Hag's and Thomas Tuchel, are all the same. Bayern Munich got to the Champions League semifinal because of the quality players they had, despite that they have quality players Tuchel failed to manage the club. I don't want Manchester United to appoint a coach who failed to manage his previous club.
In addition, Unai Emery is far better than Ten Hags in the Premier League this season, they performed very well and finished the season in 4th position, I don't think Ten Hags had a good season at Manchester United this season only because they won the FA Cup. Aston Villa finished last season at 7 places, while Manchester United ended in 4th place. I believe that Unai Emery has learned from last season because Aston Villa's performance was quite different from last season and Manchester United's performance keeps getting worse. If we're not for the FA Cup trophy they won this season Manchester United would not play in any competition next season.