WHen I was in graduate school I was reading a lot of papers in big chunks. Eink wasn't around (nor were tablets), but I absolutely hated the headaches I would get trying to read them off my LCD monitor. I can't imagine I would have liked reading 100's of papers on an IPad or similar tablet because I still would have gotten the headache. I ultimately printed out a lot of documents and spent my time reading a hard copy.
I would have wanted what the OP wants. It's convenient. PDF's aren't that memory intensive on a device. They would really only have to load a bit at a time anyway.
Regardless, the research world is only a small subset of people, so the benefit to developing such devices is going to be much more limited in general (although as a musician I would love such devices for sheet music).
Perhaps the future will bring more progress and acceptance of the technology.
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