I agree with the thought that the burbs have taken over class AA.
The last non metro champ was Grand Rapids back in 2017, but that appears to be an isolated event because according to my math, a metro area team has won class AA 23 out of the last 25 years now.
Several teams in recent memory have also voluntarily moved from A to AA. Benilde and St Thomas come to mind.
I’m still bitter about Minnetonka losing to Chan last year in the sections. That team was the all star version of a varsity squad.