The Kindle's real failure is the lack of a bigger screen. For effective reading of Textbooks/Technical papers etc. a 10-13 inch screen is a must. They did start off with a 10 inch screen but have regressed to the current 6-7 inch format which are good only for the "popular" books.

The best would be to design a dual screen book-like device like the "Surface Neo/Duo" but with e-Ink display (preferably colour) and give me an easy and affordable way to download Technical papers/Textbooks (mainly in PDF format). Allow markup/annotations and the ability to print/export notes/everything and every Student/Teacher/Professor will buy one. Bonus if i can use it as a second monitor (ala Onyx Boox Max 2). No other distractions are needed. All the money goes into the display and giving me a complete immersive book-like experience.