Ehhh, I think you guys are victims of the EPL hype that you complain so much about.
Douglas Luiz is good and young-ish but realistically, he's as good as a well-utilized Locatelli. This is Juve re-shuffling their deck, Luiz may fit their system better but 50m is not cheap by any mean. Imagine paying 50m for Locatelli after his best year with Sassoulo and Italy.
Same to Khephren, he will be a big downgrade from Rabiot. Remember, one is starting for France and the other is not even called up.
The situation hasn't changed much, Juve have always had an expensive squad with a lot of quality in there somewhere. It's up to the coach to make the best use of squad.