I think senior club managers can also make mistakes. I am curious about Thomas Tuchel's performance like everyone else. Despite Nagelsmann's not bad statistics, his brutal dismissal from the club even took place in the world press. Many sports commentators said they found it pointless. I hope Tuchel draws a good graph from Nagelsmann.
That was indeed brutal and happened suddenly when no one see it coming that fast. I believe most people expect him to be sacked if Bayern lose Bundesliga title or get kicked from Champions League. That wasn't the case obviously that's why everyone is talking about it.
Bayern have high standards and when they see a bad trending they just cut it off without much hassle. Poor Nagelsmann, he didn't deserve that but I assume he expected it at any moment. This doesn't mean that Tuchel will get green lights to do whatever they want or an immunity from being sacked, it all depends from the results.
We might not really know the reasons behind his sacking. But you don't drop.10 points at a club like Bayern to second position and expect the board to be smiling at you. The standards are too high. Champions league, 100% yes. But has he won it before? NO!. Club is not confident he can secure either the champions league or the Bundesliga.