Clokwork hello, little late here, I am a avid samsung user that came from using ipads back in 2010's when there were absolutely no symtoms. Right now I do currently own and use the s8 ultra, with a matte screen cover, and I do have to say it is the only device in my home that is soooo boring because of its non-existent brain twidling. Unlike my ipad 12.9 5th gen (the only device i cant like at all use) , or other devices (s22 6.1, apple etc.), this device has no stimulus at all!. When I first bought it(six months after launch) Sometimes the rare "android stutter" was horrendously annoying, but after an update to the current os, it has dissapeared 100%. Also, i found that the extreme size (not unwealdy and heavy though, much better for shitting and watching with one hand than 12.9ipad) made it so that without matte-light-dispersing-screen protectors, the light matter bounced off is intense and large, so unlike my s22 which is small and therefore my body blocks most large light emitting origin points from reflecting off, this device sure needs a matte screen protector if you are at least quite sensitive to any light. I used the 128gb cheapest non cellular model sold in south korea. Hope I can help you with this knowledge. (My settings: natural color(must for all samsung phones for better colors), fast refresh rate also must for no headaches, slower animations in developer mode if you are really the tricky bunch (like me).) Please be safe and use better devices!!
EDIT: *please this is only my experience with the s8 ultra tablet if u have ANY symtoms over any device, you're body is letting you know that what you are doing is damaging and unsustainable towards you're overall health, please stop when you START to feel weasy, or otherwise. Take care.