Doubts arose to Bayern Munich after management fired Julian Nagelsmann and appointed Thomas Tuchel That was considered a big mistake, the board of directors made steps that made this team worse.
Thomas Tuchel has quite a lot of experience in several big clubs but failed to compete with Xabi Alonso so when Vincent Kompany became the next choice doubts were even greater because the coach from Belgian did not have much experience, even he failed when he competed in higher competitions in the English league with Burnley, but it seems that Xabi Alonso's success has inspired other clubs to entrust their teams to be trained by young coaches, but of course the results will not be the same so it is understandable if Kompany will be doubted especially if at the beginning of the season Bayern Munich does not start smoothly.
I also worry about Bayern Munich choice to fire Julian Nagelsmann and hire Thomas Tuchel. It seemed like mistake. Even with Tuchel experience he didn't do well especially compared to Xabi Alonso success. Hiring Vincent Kompany who doesn't have much experience has made people even more doubtful. While Kompany and Alonso show promise it is unfair to expect all young coaches to achieve same success. Bayern Munich slow start to season has made people question Kompany ability to lead team. Only time will tell if Kompany can prove himself and make people believe in him. May be he will be best.