My original GBA was an "e-reader", this is just some buzz-word ridden hype, I think. I think so long as you could adjust the colour scheme so it's easy on your eyes (and everyone is different with this) then it's really nothing out of the ordinary since like 2002 and Pogoshell.
What would be extraordinary fail would be if you can't adjust the colour schemes, of both background and text colour. If can't, I'd prefer a GBA and Pogoshell!!!