1. I’m not giving my opinion. I’m stating fact. There are 100’s or 1000’s of pages of research to back this up.
2. It doesn’t require physical damage.
3. It can be an issue with some sealed pieces. Some others might develop the issue over time. Some others might develop the issue with iOS updates. All of that is irrelevant. Once you get the issue, the only way to fix it is to change the device.
4. This is NOT software related. iPad Pro owners have this issue ever since iOS 10. No software update so far has fixed it. In rare cases for some people, sometimes software updates might fix it either temporarily or permanently. But by and large it’s a firmware issue.
Do you understand what firmware is?
It is software for your hardware. And the chances of an iOS update fixing it are slim to none in most cases.
If you still don’t believe me, I wish you luck. I do request you to drop a message here in a year or two regardless of whether you manage to fix the issue by then or not.
The good thing is, if you can prove this issue in front of an Apple genius, by means of a video or otherwise, he is very likely to swap your device no questions asked. They’ve been told to do that without acknowledging that the problem is actually widespread.
But, firmware is still software as you said yourself. And firmware can be updated. A hardware issue to me is something physical such as a screen delaminating etc. My 2017 12.9 iPad Pro is plagued with this issue. I had one replacement about a year into ownership and am now out of warranty and out of luck.