Virtually talking, Dortmund get the Bundesliga title and throw it to Bayern Munich at the last moment for no reason.
It is true on paper Bayern Munich added another trophy to theirs but they should not consider that as an achievement. They should regret playing that way in the previous season and they are doing their best to rebuild the squad. They are seeking now Harry Kane to close the gap in their attack line and Kyle Walker to consolidate the defensive line.
I think you are definitely right, that Bayern Munich should not be happy with the last season even though they managed to win the Bundesliga trophy literally in the last minutes of the season. I also think though that the officials and also the players of Bayern Munich are very much aware of the fact that they have played a very bad Bundesliga season and that things needs to change and to improve for the coming season.
Almost every player that i saw in an interview after the last Bundesliga season has said things like that.
The squad of Bayern Munich will see some significant changes in the next week i would guess. Players like Pavard, Sommer and Mane are likely also Goretzka could leave the club too while other players will join the team instead.