I would love to have an eInk tablet that I can watch videos on (color not required). I frequently watch educational YouTube videos before bed, but I’d prefer to have something that isn’t beaming light into my eyes. Does something like this exist on the market today, or do I need to wait until this product gets released?

That's about the worst use case for existing eink panels, as they have a limited number of switching cycles before the dots start to degrade.