Yeah, agreed that he's talented but wants massive, massive wages, is injury prone and has a shitty attitude (apparently) as well.
I'd steer clear, but if Tuchel could get him committed and back to his best, he'd be immense for them.
I think the attitude thing is overblown. He has had a massive issue with professionalism when it comes to time management and showing up to training on time, but I don't think he has a bad attitude and Xavi's actually been very complimentary of him and his work ethic in training. He has a suspect past, the way he forced his way out of Dortmund was definitely a case of bad attitude, but I think he's grown since then and Tuchel is a massive fan of his, considers him one of the best talents he's ever managed so I have no doubts he'll go for him. People grow up and become more mature, let's hope that's what's happening with him.
It's just a massive gamble because of his health, and he is a player that can frustrate by doing the impossible in one sequence but then messing up the simple pass in the end. He hasn't really shown much progress but he was so devastating already at 19 years old that even if he stayed at that level his whole career, he'd still be a great player for any side but the most important thing is to be available, and he simply isn't enough.