First of all, just extrapolating out the innings (which means ignoring Sale’s most obvious weakness) does ignore that that doesn’t always work so well. Fatigue, etc.
Second, have you seen how Matz is doing?
Third, Kluber was better and actually durable the year before the Sox acquired him. But, as happens with every pitcher, he got old and did so fast. Just because Sale hasn’t didn’t mean it wasn’t a concern…