the keys prelude pushes you towards with guru-mode are not the ones on the home row (hjkl, which is justifiable) but keys originally chosen for english words: n(ext), p(revious), f(orward), b(ack). It's mystifying, these aren't ergonomic at all, but just memnomics to help teach navigation _in the absence of clearly marked arrow keys_. So if anything, rather than being for gurus, these are keys for beginners.