There are so many variables that influence the amount of touches a player has. I don't see the benefit in putting any weight into that statistic, personally. You would have to add a lot of filters for it to hold weight. For example, if you are losing a match and the opponent is sitting off you, Pjanic could make 200 passes. What does it matter?
I would rather focus on vertical passes. I think it tells more about the player and the team.
Comparing Allegri/Sarri based on how often Pjanic simply touches/passes the ball is naive. What does it matter if Allegri wants Bonucci to pass straight wide to the fullback and Sarri wants Bonucci to pass it Pjanic and THEN to the fullback, for example?
There has to be more nuance to the evaluation.