I think it all depends on the device and its specific lighting strength. For my money, it makes sense to have a reasonable brightness range to accommodate for sight and personal preference, but on my Aura One, I feel the range is just beastly. The top third if not half of the scale is simply too bright, to the point that reading on an LCD/IPS panel is actually better for the eyes.
I keep the brightness mostly off during the day, or perhaps on 1-3% - enough to get contrast benefits or remove any annoying shadows and such, but negligible as far as eye strain is concerned. Around dusk, I might bump it up to 4-5%, but with some night-light to bring it to a nice creamy, paper-like colour. Even in pitch-black conditions, 1% with reduced blue-light is actually pretty serviceable.
Again, for my purposes, I'd appreciate more nuance in the lower range and less brightness overall, but I do acknowledge the possibility of someone using their Aura One at 80%, no matter how incredible that seems to me. But then again, I'm on the younger side and still not wearing glasses, so for all I know I might be the outlier. Somehow, I believe that the folks using 80+ brightness on their devices simply have devices with lower brightness levels overall.
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