I don't want to offend anyone, nor invalidate your experiences, because I suffer this problem as well. However, recently I had some experiences that are leading me to think that there's a psychological aspect on this.
I'm not sure if the first batches of the iPhone 13 mini were different, but I remember using my first iPhone 13 mini, gorgeous starlight, during the holidays of 2021 without any issues. I returned that unit because we didn't have a method to unlock with a facemask on, and I have been using a facemask on most closed places until recently. I wasn't aware of the PWM issue by then, and I don't remember having that problem back then.
Then, I decided to purchase the 13 mini again during the summer of 2022, when we finally had FaceID unlock with a mask, and it was then when I started to feel eyestrain, to the point of my eyes getting red. That was when I started to look this issue up and I realised I wasn't the only one... I returned it, and during the holidays of 2022, I purchased it again in midnight and the problem was still there although less severe. So I returned it and said goodbye to the chance of having a mini iPhone (unless I have the courage and knowledge to exchange the screen for an in-cell LCD one).
However, there's more. Here's my experience with my most recent purchase, the M2 iPad Pro.
Initially I purchased the 128GB unit and was using it during the holydays of 2022, with no problem, so I decided to go for the 256GB version in order to future-proof it and keep that device for many years. And then, the problems started. Mind you, the 256GB version has a different screen than the 128GB version, because I was able to compare several of them. The 256GB has a warmer hue, slightly more saturated colors, and better sharpnes but I think slightly lower response time, but I'm not 100% sure of that because it is really subtle. But, yes, the screens are different, and possibly from different manufacturers.
With the 256GB M2 iPad Pro I started to have sore eyes, and headaches. Maybe it was from over using it? Maybe it was my eye's health? I went to the ophthalmologist, and she said "there's a lot we still don't know about screen effects on our health in the long term, probably in 10-15 years we'll start to see a lot of pathologies that could be caused by the massive use of screens. In the meantime, just try to reduce the use of screens and spend more time outside" And then I told her that, like most people nowadays, my job/studies/hobbies/social interactions require interacting with a screen. So she replied "then it is a matter of trial of error. If you notice a screen is comfortable to your eyes, just use that. If you find it uncomfortable, just don't"
So I returned my beloved 256GB M2 iPad Pro, and after a month I purchased both an 128GB and weeks later a 256GB model. With the 128GB I was fine, but when I wanted to use the 256GB my headaches started again. After some days, I got used to it, and when using the 128GB model my eyes got sore again... To the point that I didn't even know what device was producing the discomfort. I kept using both and the sympthoms remained for both, but the returning window was about to expire so... I decided to return the 256GB again. And kept my 128GB model, because despite it causing discomfort, I had been using it without any issues for three weeks prior to getting the 256GB model. And most importantly, in case of more problems, it would be easier to sell the base model rather than the 256GB model. I would lose more money if I finally had to sell the 256GB model in the second hand market.
And... guess what happened once I returned the 256GB model and kept using the 128GB model, without the stress of having to decide which one to keep. Yes, I'm still using the iPad Pro without any trace of eye strain or headaches. Which leads me to think that maybe this has a psychological component... or maybe changing the screens every two days was what triggered the problems, I don't know.
All in all, I kept the 128GB model, and maybe this is a bit of an off-topic, but now I am a bit worried that it will be not enough in the long run, or that the SSD will degradate in a shorter time than the 256GB model, because that one should have double the TBW (Terabytes written until the SSD dies). I use pretty intensively the iPad with video recordings that take 2 to 3GB each day, then transfer it to my mac. So I am more worried about the health of the SSD in the long run than about the capacity, as external drives exist.
But, given the circumstances, I preferred to opt for a better, more comfortable screen -for me- than having more SSD, which could have come in handy. Of course, I don't plan on gettiing an OLED iPad Pro lol both because of my eyes health, and the exorbitant price Apple is going to charge for it.
TL;DR: It's saturday, and I wanted to talk a bit somewhere, feel free to ignore this brick if you don't feel like reading it.
