It's a mix. We have been incredibly unlucky with impact injuries, but the amount of muscular ones is also very big. Dybala and Bonucci just ripped their muscle, this has been happening for a long time. Last season was crazy too. Of course eh physical trainers must be held accountable.
The medical staff has also been very insecure when dealing with diagnosis and recovery time. We have had a lot reccurrances on players on recovery. Just think about the Pjaca incident.
Priority is to change the phyical training staff, but wouldn't bother to see changes in the medical team too.
Actually, Marotta should be held accountable for this. Last season was unbeliavable already, Allegri's staff has a lot of history from Milan and changes should have been made.