As far as I know, Kompany is a coach who is not on the top list of coaches they will choose. I read the news which said that actually the Munich management had approached several coaches who I thought were great coaches but unfortunately they rejected them. An example is Xabi Alonso who chose to try to stay at Leverkusen. In my opinion, it is very difficult for Munich to dominate the Bundesliga and become one of the favorites in the UCL. I agree with you that Kompany is not an experienced coach so I don't expect much from him.
Not been on the list of coach Bayern Munich wanted at this point doesn't really matter anymore because he has now been appointed as their coach and the only thing that can be done now is for him to get to work a s show how deserving he is of the job and make Bayern Munich not regret hiring him even after they had approached others, Bayern Munich will be impressed if it turns out kompany performs well.
This is a huge challenge for kompany to prove Bayern Munich wrong for approaching him lastly after exhausting all that was on their list, they made a big offer to xabi that I think almost got Xabi over from Leverkusen but in a second taught it looked akward after fighting them and defeating them, using them to fight the same team you won them with begins to feel really unusual and awkward, staying back at Leverkusen was a very good idea xabi considered because having to be in the bundesliga and coaching teams against the other really do feel somehow even to the coach himself.
Bayern Munich can still do well under Kompany, we all know how well he isn't experienced enough for a team like Bayern Munich but then for every top coach just like Xabi now, there was a first time after which they became one of the best I. Their job, so maybe this will be that first that will bring kompany to the point where he will then be recognized as a top coach that he should be, so he should reduce the pressure and do his best but make sure to get beyond their expectations and let much not be expected of him tho.