Some points of contention:
-SOT is massacred by enough iOS updates. This is the point that sometimes slips by, when discussing this, many dismiss it because they compare one major version to the next, say, A12 iPhones from iOS 16 to iOS 17. I don’t care about that comparison. The only comparison that matters is to the original iOS version, anything else is irrelevant, and if updated far enough, battery life plummets, especially on early 64-bit iPads (earlier than the 3rd-gen iPad Pro, so Air 1-10.5-inch iPad Pros, and add some base iPads there, too).
-Battery health is only relevant if the iPad is updated, and it is henceforth irrelevant if you keep the iPad on its original iOS version. Why does everyone argue with this? Very simple. Nobody uses original iOS versions long enough. Do you see anyone with a 10.5-inch iPad Pro on iOS 10? Do you see anyone with an iPhone Xʀ on iOS 12? Those users update to obliterating iOS versions like iOS 17, replace the battery, and see an obvious improvement. Therefore, when I say battery health is irrelevant if the device isn’t updated, they obviously don’t buy that statement, because everyone’s experience is the opposite, but everyone misses the key point: “when the device IS NOT updated”. If you update far enough, this no longer applies.
-Standby time has been poor on original iOS versions ever since iOS 12 on iPhones and iPadOS 13 on iPads. It’s just bad, regardless of battery health and the iOS version that the device runs. Apple broke something really badly with standby around 2018-2019, and they’ve never fixed it. My new Air 5 on iPadOS 15 is way worse than my over 7-year-old 9.7-inch iPad Pro on iOS 12, and way worse than a four-year-old 6th-gen iPad on iOS 12.