We are drifting further and further off topic here.
Going back to the topic, I would not recommend getting an e-ink device for viewing videos. I have the Boox Tab Ultra C, and while Youtube is very much watchable on it, it butchers the video quality. Web browsing is fine though.
Also, do you get the same eyestrain when looking at computer/TV screens? If not, your eyestrain might be caused by PWM, and turning the brightness on your iPad Pro to max might actually ease the strain.
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