QlaGzr OK. Interesting. Having had the PWM issue for close to 30 years, and researched the topic, I've yet to hear that anyone would have an issue with a higher resolution.
I had the Sony Xperia XZ Premium that had a small screen but still 4k resolution. I would think it would be simply impossible for anyone to sense the difference, especially if watching the screen from a yard/meter if it is a 4k resolution or 720p, thus I would think that this would be a way to verify that it is not the resolution, it is something else.
Before I knew about PWM, I also kept playing with display resolutions and scalings, thinking that it could be the source of the problem, but after I learned about PWM and got a PWM free display, I realized that resolution does not have anything to do with the problem.
But yeah, sorry to say this, there is a large group that has a problem with flicker (PWM, temproral dithering, other sources of flicker) and there is no doubt about it that the problem is the flicker, even very high frequency flicker, like 2500 Hz, which absolutely is not perceivable to the eye. Then there seems be a large group with issues that seem to affect a very small group, like those who have issues with certain driver versions or amount of blue light or like you now, resolution.
For the blue light, I'm pretty sure it is rather the flicker. For the driver versions, I think it is also flicker. For the resolution - could it also be flicker?
Problem is that if we have a 1000 sources of problems with the displays, we will never be able to fix the issue because no manufacturer will manufacture a device that does not flicker, conforms to a certain old driver version, has a resolution of only 720p, has no blue light etc. etc.