Yeah, agreed regarding the distinction. I don’t pay much attention to reloads, so while they might happen more frequently on iOS 12, I haven’t really noticed. I am not saying they aren’t there, though. It’s just that I don’t really know with certainty whether they are.
Regarding battery life, firstly I’d like to say that I don’t mean to discount your experience. Also, this conversation isn’t included on the following paragraph, because you haven’t said that.
That said, I’ve discussed this with many people who staunchly defend iOS updates, and the pattern is always the same. “You are fear-mongering, battery life is just fine on my 9.7-inch iPad Pro on iPadOS 15 (or my 10.5-inch, or my iPad 5, a similar-aged model). The fact that it has worsened for you is something I cannot explain, but mine is fine, and iOS updates - they state this far more forcefully and categorically than you have, almost dismissing my statements - do not, under any circumstances, decrease battery life”.
I’m like, “okay, fine, I believe you, even if I seriously think it does, and I will not dismiss what you’re saying. May you please share a screenshot of your battery life?”. They do and... 5 hours of screen-on time. 6 hours. With 88% of the usage being Safari and the rest being some light reading. Then I say “6 hours? You think that’s good? I got 14 back on iOS 9, I’m getting 10-11 on iOS 12. 6 is awful”. Inevitably, excuses ensue: “But it’s old, but battery health, but different usage”. I track battery life very closely. 13 hours aren’t 11 (with some luck, the vast majority of the cycles it’s below that).
You said that “the difference is very minor, to the point where I don’t care”, and depending on your definition of minor, I agree! I reckon some people would be very happy with 10 hours I am getting. Can you consider a 14 to 11-hour drop minor? Yes! It’s enough for a full day of light use, then it’s fine for some people, hell, maybe they wouldn’t even notice. And it’s fine! Just like I don’t notice any difference regarding reloads, but notice the difference. What did I say in my first paragraph? I don’t track them closely, so they might be there and I’m not noticing”, and - I’m adding this now - the fact that I’ve read several people mention iPadOS 13 as the cutoff for a lot of reloads, whilst noting that worsened even earlier leads me to believe that while I haven’t noticed them, they are there, and I just don’t pay enough attention.
Completely, absolutely agree on “today’s chips have improved enough so that performance differences aren’t noticeable”. The A6X on iOS 9/10 (three versions in) is horrible, whilst my 9.7-inch iPad Pro on iOS 12 (also three versions in) is nearly flawless. Not to mention the iPad Mini 1... the A5 on iOS 9 is unusable. This is not the case currently, and it will be better as chips get better. I’m inclined to believe that the M1’s performance on iPadOS 17 (three versions in) will be even more flawless than my A9X-powered 9.7-inch iPad Pro on iOS 12 is. Battery life? Remains to be seen, though I am not confident, considering they shredded the iPhone Xʀ’s A12 Bionic by iOS 15. Like you said, performance is fine, totally smooth. Regarding reloads, I though maybe 4GB might fix it, but they don’t, so I’m more of the “wait and see” opinion now. It’s difficult to predict.
A key difference in our view is “I’m willing to forgo battery life as long as performance isn’t impacted to get new features”. I’m filling to forgo any and every feature to preserve flawless battery life and performance, perhaps due to the fact that I don’t upgrade often - I only have two iPads, you have a lot more
In fact, on the supposedly top-notch M1, I don’t even trust iPadOS 16 (let alone 17 or 18), so I’m staying on my iPad Air 5’s original version (iPadOS 15).
As a final observation, I’d like to say that one of the most important aspects is that performance is a lot better than it used to be. That is something to commend.