Your carefully crafted response is true, as far as it goes. However, given that there were no playoffs in 2020 due to COVID, and given that IC Catholic won the 3A championship in 2016 and 2017 (in addition to the 2022 championship you referred to), that means those two schools have won four of the last eight 3A championships. That seems fairly frequent to me.
Additionally, when considering the substance of my statement, as most fair-minded individuals would do, it should also be observed that the primary reason the two schools did not win more 3A championships during that time span is the fact that IC Catholic was busy winning the 4A title in 2018; and Montini was busy finishing second to Joliet Catholic in the 2018 5A championship game.
I stand by the statement I made.