That's the thing though, it's not just about the X. IIRC, Most of the high end android phones use PWM as well.
And if you're locked into the Apple ecosystem (Like me), you're stuck with the 8/8+ until Apple figures out a way to use OLED without PWM. That could easily take a few years. Assuming they use OLED in all of their phones from now on, we're completely locked out of any new tech. It's really disappointing.
This is what happened to me with laptops for over 5 years. I had to keep using old CCFL displays until the manufacturers started using non PWM displays. No one I talked to believed that the flicker could be capable of causing eye strain.
However, I do believe the brain/optic system can adapt to some extent. I use Phillips Hue lights in my apartment, which also use PWM. It took me a year of slowly increasing the amount of time using the lights daily until I could tolerate them. Now I'm fine using them indefinitely.
There may be some biofeedback occurring whereby the eye stops trying to vary the size of the iris with each flicker (this is complete speculation on my part, I have no data to back this up).
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This may sound dumb but how do you know if the display is flickering? Is it seen to the eye? As an owner with slight headaches since 11/3 my only culprit is the phone but would want to confirm before I return it for the 8+. Since I only have 5 days left to do so too
It can easily be seen by taking a slow motion video. However, I can also see individual screen frames interspersed with black frames with the galaxy series of phones if I rapidly move my eyes back and forth in a left/right pattern. I can also see the flicker out of the corner of my eye when people move the phones near me.
The touchbar of the MacBook Pros also has a low refresh rate and has the same flickering appearance to me. However, I only look at it briefly so it doesn't bother me.
You can also see the refresh rate on the Apple Watch using slow motion video. I've had the watch for three years with no eye strain, but again my interactions with the screen are < 10 seconds in most cases.