In my opinion, Bayern Munich's recruitment of Kompany was carefully thought out so that the decision to appoint Kompany as Bayern Munich's new coach to replace Tuchel was the right one. Kompany's philosophy is very suitable for Bayern Munich at the moment, especially since he has a quality squad, which is very different from when he coached Burnley, which did not have good players. So I'm sure Kompany can bring big changes at Bayern Munich, I'm sure not all clubs recruit coaches to be fired, of course clubs recruit coaches to make the team stronger. So don't talk about dismissal too early, because the league hasn't started yet.
I believe in the mentality he brings, his charisma. If the players follow in his footsteps, next season Bayern Munich can compete in the Bundesliga and UCL League.
It is true that Kompany's quality has not been tested, but that is no longer the benchmark, now it does not rule out the possibility that he will be successful at Bayern. Because this has been proven, like coach Alonso, he has proven that coaches who are younger and don't have much experience can be more successful than experienced coaches.
Bayern Munich made smart decision by choosing Vincent Kompany as their new coach. His ideas fit team needs and he has talented squad to work with unlike at Burnley. Kompany leadership and personality will inspire the players and they will likely follow his example. While he does not have a lot of coaching experience it is unfair to judge him only on that. Other young coachea like you mentioned Alonso have done well despite their limited experience. I believe Kompany will bring new ideas and energy to Bayern Munich and they will be strong team in both the Bundesliga and UCL. Let's not assume he will be fired too quickly instead let's give him chance to show what he can do.