With my iPad Mini 4, when IOS 16 was released I started to be left behind. My iPad Mini 4 shipped the first of August 2019.
I only realized how seriously obsolete it was when HomeKit quit working. The new HomeKit architecture requires IOS 16, so my a little less than 5 year old iPad is obsolete.
Given less than 5 years from purchase to major Apple app not being supported, my next tablet will be a cheapo Android as I won't be under any illusion it will support major Apple components and I will be serious money ahead. It is getting harder and harder to want to stay in the so-called Apple ecosystem. I understand Apple has revenue growth problems, but solving that on the backs of existing users is getting nutty.