I think this diagram is useful not as a user reference manual, but as a discovery tool. I look at it and say "I know that, I know that, I know that- oh! I didn't know that one." I think it should say "Prerequisite: complete vimtutor" at the top, or have something else so people unfamiliar with vim don't just have their eyes glaze over when they see it. Perhaps a note explaining that very few people actually know all of these commands, and you only need to know about 5 of them to use vim. Basically, the graphic would be much more useful with some context to explain how it should be used or not used, by whom, and what it contains and doesn't contain.