Yea, they likely want to move on from iOS15, which is fine[1]. But at least let existing users with the existing iOS15-working app keep using that app version. But no, instead, they issued a final "update" which does nothing but block iOS15 users with a full screen modal that you cannot skip (as far as I can tell). Totally overboard. I hope this doesn't start a trend.

1: I don't see what the big deal is to just put if statements around any iOS16-requiring new features, yet keep targeting iOS15. We did this all the time back when I used to write iOS apps.