Ok, interesting. If that's the case, the representation on Sony's website is blatantly misleading (thought I see similar claim for Onyx product as well). I like having those margins to write annotations and stuff, but well, need to live with what's available in the market.
https://www.sony.com/electronics/dig...specifications
Letter-size screen
Digital Paper has a 8.5" x 11" screen, so there's plenty of space for notes and annotations, and even to compare two documents alongside each other.