From what I've seen, Juventus' squad isn't 100% the same as it was during Allegri's time. This means that the new coach has had room to make changes and yet Juventus is still not fighting for the title. When a team doesn't get good results, then it's all the coach's fault, because it's up to the coach to choose the players who will be on the field, define the formations and positions of the players and also choose the new signings.

Juventus = 22 games, 8 wins, 13 draws, 1 loss, 37 points

Lazio = 22 games, 12 wins, 3 draws, 7 losses, 39 points

With this current coach, Juventus won't be Serie A champion this season or next.