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.