Vincent Kompany is not a mistake, Bayern Munich will push better for brilliant results and they've become one of the top clubs to withstand pressure. Believe me when I say, Bayern Munich will fire for excellent results and they're the best in Germany. Bayern Munich have come to the standards of elevating their club so appointing Vincent Kompany was probably the right choice for the club it's all clear when they're desperate for winning.
But the fact that they signed Vincent Kompany after receiving refusals from many other coaches (if I’m not mistaken, we are talking about 9) raises certain suspicions. I'm not saying he's good/bad (I don't have an opinion on him yet) but he certainly wasn't their first priority when they were looking for a coach. It is all the more surprising that the contract with him is quite long-term, but apparently there are clauses (about results) that allow it to be terminated early.
The management's inability to trust the manager has led to questions about other coaches' ability to lead Bayern and this is also making some coaches were thinking for twice before try . Remember when Bayern Munich fired Naglesmann by phoning him on his personal phone? Bayern Munich has done the same by instructing Tuchel to leave the club before the end of the season. This makes some coaches were taking a lesson from what happened to the him.
It raises a lot of doubts about how capable Bayern Munich is here. There is no doubt that numerous coaches were rejecting offers from Bayern Munich. It is due to the club's inability to support a long-term project.
They wished to receive the results as quickly as possible. The coaches are asking a lot of questions. As you mentioned, Bayern has been rejected by multiple coaches.
Xabi
Naglesmann
Tuchel