Thomas Tuchel joined Bayern Munich in the last weeks when he had not had enough time to even know the teams and have some pieces of training with his team, that's why we can't expect to see more from this coach.
The moment when he joined Bayern Munich they had one game and they there was a hard game for Bayern Munich in the champions league against Manchester City.
To assess Bayern Munich's performance through coach Thomas Tuchel is next season, not at the end of last season because time is so tight that there is no performance that is more worthy of evaluation in general. Thomas Tuchel needs to deploy the Bayern Munich team next season, especially in the Champions League because Bayern Munich always looks better in the Bundesliga so Thomas Tuchel only needs to polish his players to face the Champions League next season apart from the Bundesliga.
Thomas Tuchel has only coached Bayern Munich this season, so if you want to see if can bring Bayern to play well, have to do it next season when they play in the Champions League.
For the Bundesliga they have played well and ended the season in 1st position having the same points as Dortmund in 2nd place.
Bayern Munich will also compete in the DFL Super Cup final against Leipzig, I'm sure Thomas Tuchel with Bayern will be able to win the cup.