The baffling selection of stuff is down to the part where users are the ones posting and filling out the articles - so it's just "oh, this particular person knew about this one thing and thought it was relevant" rather than "this is generally agreed to be more important than these other things we didn't write about". The other issue is - well. Back when I was briefly out of work I spent a bit of time updating fanlore things, and. It's a huge amount of work that I would definitely not have been able to do while working, and I only wrote maybe two or three articles! And while I was there I noticed maybe three other people MAX being active. So: there's about three people actually doing anything regularly, and a smattering of others stopping in occasionally to drop a link or write half a post. So that's a huge factor in the occasionally weird selection.