As a new coach in a new club, you have to try some formations to find a best one for players you have. Ten Hag is just doing that job and the temporary result is acceptable that allows him to continue his trials.
The defeat against Aston Villa confirms a fact that Manchester United need to have some supplements from transfer market. If they want to finish in top four and aim at higher targets next season, they should start a good preparation since this season.
what you say is true, actually MU's defeat against Aston Villa is still within reasonable limits, ten hag still need to find a good strategy and formation for the squad that MU currently has
I personally am very confident that by the end of this season, Ten Hag will be able to bring MU to finish in the top 4 of the EPL, the homework ten Hag is not easy