Did you try the 11 or the 12.9? & did you have the same symptoms as if you were using one of the OLED iPhones?
My PWM discomfort with lager screens can be described as disoriented, failure to focus and blurry eye drift. (I tested the 12.9 2020 IPP. FWIW)
With the PWM phones, its more sharp and pronounced. It actually makes me very fidgety, frustrated, impacient and of course gives me the dry/bruised eye feeling quick.
Had Lasik surgery 10+ years ago. I have my eyes checked yearly as well and they check out fine with normal testing.
Off topic slightly,
I tried a friends 13” Razer Blade Stealth 2020 1080P 120HZ screen laptop last weekend. He was very impressed with it. However, I could not take more than a few minutes of that display. I dont know the readings on that, but the PWM has to be off the charts!
The last good laptop display I could use for hours was the Lenovo X1C 7th Gen- Flicker free, 1440p, 96% aRGB + HDR. Would put that on any current laptop at a premium if I had the chance/option. No questions asked!
Final last tidbit. Samsung, king of slapping OLEDs on everything, recently released a good flicker free LCD tablet in the Tab s7. (Not the s7+) It’s still Android, with Samsung overlays ... but is cheap for a good, quick, non PWM alternative tablet. ($200 off as of today)
OLEDs are not the problem. LG OLED TV’s do not use digital controllers and show no signs of PWM. This is all down to the controllers used and more likely than not, intergrated in the panels ribbons/cables so that OEMs have zero choice in the matter.