I have not had any issues with iOS 13 on my mini or Air 2 (granted once one has upgraded everything it is hard to know if iOS 13 upgrade caused a given problem), and love the new features, so the idea of pinning to iOS 12 seems sort of wrong. But YMMV.
I’m just waiting for the first (of hopefully several) reading apps to support multiple documents. This will make it easier to study languages (original on one side, translation on the other), pair a book with a notebook page (Notes for now, other apps when they add support), web page, map, or whatever, and switch between these views quickly.
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