>Here's hoping this spurs Amazon to bring back a large format e-ink reader.

Ideally with color support. Color does so much for learning, whether it's syntax-highlighted code samples or microbiology explanations.

I would think you'd want something more like an Android or Apple tablet using a format (maybe PDF) that let you annotate/make notes using a pen or keyboard. (As well as the usual bookmarks etc.)

Also, looking back at my notes and other materials from school I usually ended up with a few hundred pages of paper from a given class. Whether or not that all transitioned to digital for initial creation, you probably would ideally like to archive all the materials from a class together in one place.

I dislike reading long-form text on backlit screens. All those features you mentioned sound great, but I can't read an iPad for hours on end.

There is reMarkable that some people seem to like a lot. The problem with epaper though is that it doesn't work great when you depend on color or rich graphics generally and it's hard to guarantee that textbooks won't have those sorts of dependencies.