1. Comfort reading for long periods.
2. Ability to read outside in the sun.
3. Battery duration.
Of those, by far the most important is the first, and this product is specifically targeted away from that. The third isn't a big deal for a stationary item that can be wired or plugged in.
I wish you well, but I don't immediately see the problem it's solving - though there may well be some sort of gap in markets dealing with outdoor products, eg garden centres and the like.
This looks like a product well-suited to that sort of use case.
Reduction seems to be an important trend considering drives to try to reduce green house gas emissions.
Some of us just prefer the look of e-ink displays.