People aren't monoliths, so yes he can still get along with younger players. But his methods eventually wear them out. He was good at Roma for 2 seasons, and in his third he was a disaster. Which is the pattern of his career post Chelsea. The problem is, it's one thing to get the likes of Mancini, Pellegrini and Zalewski - people for whom being coached by José is the highlight of their existence - to buy in, quite another to get the Pogbas, Fabregas, etc, to do the same.
He is still a good manager by any metric you care to look at. He's also not a top manager anymore, by any metric you care to look at. Roma, Fener, Olympique Lyon, Porto, these are his level now