The thing I didn't understand last season was how Tuchel managed that poorly.

I mean Bayern Munich had a wonderful squad, absolutely a complete one with adding Harry Kane also to the team.
Considering Tuchel isn't actually a bad manager, it was a really surprising thing to me. Their Bundesliga performance was horrible compared to the previous seasons. I don't know maybe he was going to fix things if he was given one more year but still...
As Kompany is like a noname as a manager for most people, there is some worry about this choice. I just hope he can surprise everyone and make a good competition against Xabi Alonso unlike Tuchel's work.
Yes, I also see that the strength of the Munich team should be much better than Leverkusen but it seems that Kane's arrival did not bring any results to change their position and Tuchel seems to have failed to rotate players well so several mistakes were made, Munich's focus on the UCL also failed because they were defeated by Madrid and especially after Leverkusen shifted their position and broke their dominance in the Bundesliga, this is what ultimately made Tuchel no longer used, even though if he was given one or two seasons it would definitely make Munich the team they want and hope for.
But the decision was taken too quickly so that Kompany replaced Tuchel, although perhaps many people doubted Kompany's ability to manage the Munich team well next season, but no one knows because it could be that Kompany can make this team able to compete with Xabi Alonso's men. namely, with Leverkusen having broken Munich's dominance by winning the Bundesliga last season, I also can't wait to see Munich's first debut in the new season, hopefully it won't disappoint all the fans and the Munich board.