I think people don't consider this a mistake but a dubious condition because Kompany has not had any notable achievements as a coach so the doubts are clearly greater than the confidence he has and this is a fairness because after all a new coach is doubtful is a fairness for a big club that has an extraordinary history and of course this is a challenge for the coach to prove that he deserves to be at a big club including for Kompany who is at Bayern at this time.
We can't blame something that we haven't even seen what the results will be like but for doubt it is normal because with what Bayern have so far and with Kompany's minimal experience, it is natural that there will be a lot of skewed views on Bayern's decision.
Basically, Kompany has succeeded when he became head coach of Burnley, but when Burnley played in the second division of the Premier League or called championship. Because at that time Kompany managed to make Burnley a Premier League promotion team but unfortunately, when playing in the Premier League in fact Kompany actually failed to make Burnley get good results. Because anyway, at the end of the season that Burnley was relegated again.
With these results, then I personally will still doubt Kompany, although at Bayern Munich of course have better finances and squad compared to mediocre teams like Burnley. But, because Kompany failed to make Burnley survive in the Premier League then I would really doubt Kompany at Bayern Munich. Because after all, to make Burnley not relegated too it has been a difficult job for Kompany, even more so to make Bayern Munich get a trophy amid difficult competition in the Bundesliga. Therefore, I personally include people who really doubt Kompany's ability, because I think Kompany is still not good enough for more difficult competition in the team that plays in the top division.
Kompany did manage to bring Burnley's promotion to the EPL but on the other hand in the end he also brought Burnley relegated which means there is a condition that must be a concern where he will still be very difficult for major competitions.
It's just that in this case he also still has a chance where we must realize that in the end being at a small club like Burnley with minimal resources is clearly different compared to Bayern and all its luxuries.
Still doubts will remain here and it is a natural thing because doubts like this always happen to every new coach but that does not mean we consider it a mistake from the start because after all we cannot consider this a mistake before seeing whether Kompany's performance is in line with expectations or not because the situation considered a failure is when Kompany does not get anything and cannot give a good performance for Bayern so he is considered a failure but at the moment we haven't even seen him play so he still cannot be said to have failed because Kompany has not shown his talent to train Bayern.