e2 is fairly deranged. It's not your place to head for an informative read, and "encyclopedia" would definitely not be the right word, but it's great for ideas, stimulation, not-quite-sure-if-satire, unfinished short fiction, and link chains like "geometrical" > cannon defense patterns > transhumanism > The Broken God > a cloned kitten named "cc". I think of it like /b/ for bored grad students who are into Barthelme and Jeff Noon. One of the treasures of the internet, in my book :)

Those are traditional at E2 - a quirk of that particular community. I don't think they're SEO. If done right, sometimes they make you think. Sometimes they don't even go anywhere and are still successful in that regard. Sometimes not.

Jeez the amount of time I spent on E2 in high school and college was stunning. So many open tabs as I followed those links. Even wrote an app to find the "shortest distance" between two randomly selected ideas.