Having a noob on the bench is of course a problem, but the coach's position is something that can be easily fixed. We have a much bigger problem than that.
It's very possible that we weren't gonna win this scudetto with Pirlo, even if we had last year's team (mostly Dybala and Pjanic) but we weren't gonna be this bad for sure.
It's simple, we lack quality players. That's on those who created the team.