From what I have read/heard(from things like podcasts) he fell out with the Dortmund DOF (Mislintat I think?) and PSG DOF Leonardo. I’m not sure what the issue was at Dortmund, think it was because certain players were sold and others he wanted not brought in, but I don’t blame him for falling out with Leonardo, who didn’t do a great job leading up up to and during Tuchel’s tenure.
I’ve also read/heard some fascinating things about Tuchel and his coaching, his methods, how intelligent and intense he is.
I would have loved him here, but would only have worked in the right structure, which we don’t have right now.