I've come to think that a good chunk of the resistance to written-word-heavy remote work, and to the phenomenon of "let's just hop on a quick call" where the alternative was pretty likely to be a much quicker IM exchange, is due to this exact thing—not just that a lot of people can't read at that level-3 proficiency, but that another cohort can, but finds that the absolute limit of their ability and quite taxing, leaving well more than half of the population uncomfortable in a professional reading- and writing-heavy environment, if not wholly incapable of working in it at all.