Well, I have the as-of-now latest iPad Air 5… on iPadOS 15. I never hit the update button, even if my device is the latest. Sadly, that does bring about issues with Safari, as some websites start having compatibility issues at some point (not on this iPad, but my iPhone is an iPhone Xʀ on iOS 12, and, occasionally, a website will not work), but I tolerate it.
If I had such a strict criteria, I’d have to upgrade everything immediately and I’d have to stop using devices sometimes days after purchase. Obviously not an option.
But like I have said elsewhere, these occasional Safari issues are the most annoying aspect of this, everything else is flawless. Ask iPhone Xʀ users how they feel about battery life with the original battery on iOS 17…