No one says Conte doesn't know what he's doing, everyone can be criticized for what the do.
Conte had a major part in our Scudetto, and we are greatfull and know that, that doesn't mean i have to be happy when i see Boriello on the field, i can judge him, that's how football is.
And it's not like saying why did he play Esti or someone else, cause that has some sense, more defensive work etc etc.
But choosing Boriello over others, makes none, and he gave him tons of minutes to prove his worth and he didn't, yet he starts in the final, i get not using Vucinic since he said he'll play second string players, but he could've played Quags or Matri instead.