I must admit, I find this a strange one.
Juventus have built their success on tactically pragmatic managers over the last decade. Conte was a very pragmatic, reactive manager; and then Allegri, albeit more adventurous, is also pragmatic tactically, adapting to opponents and what he has available to him.
Sarri is an idealist. He may have the quality available to him to implement his ideas, though.
Juventus maybe want to transition into a more proactive tactical philosophy? It's certainly where the game's going.