Not just unfair math, but wrong math. The average of 93+93+84 is 90. Which is the same number of wins the 2023 World Series champs had, BTW, and more than the 2021 champs, so it's not really a bad number.
Meanwhile, throwing out the 108 season as an "outlier" is ludicrous. We're talking about 1 of a population of 4.
Shall we throw out 2013 from Cherington's resume while we're at it?
You're abusing math and logic.