All due respect to Tommy T, he had some relative success at Dortmund, he couldn't manage the egos at PSG, he put a very well constructed but wrongly used Chelsea squad into a wide and compact 343 (3421) and new how to neutralize Pep's personnel (not system, mind, personnel) and got a gift of pep over think that played directly into Chelsea's hands. Then he started believing that he was some sort of patron saint of the club shop and what everyone in the Chelsea club shop was saying. Then Abramovich left, and he fell out players with which he had just won the champions league, he fell out with his new owner at Chelsea, he fell out with his then current wife, and he moved to Munich to hover in waiting for the Bayern Munich shot callers to get skittish on young Nagelsman, which they did. Directly got knocked out of the pokal with ideas the Bayern players clearly didn't believe in, fell backward onto the Bundesliga title when BVB completely laid an egg on the last day of the season, he fell out with the entire club leadership AND squad in about 3 months at Bayern and literally spent half of his tenure antagonising club executive and first team players and lost the Bundesliga title for Bayern in the first time in more than a decade.
Basically I disagree with the methods.