I guess I’ll bring up my personal #1 desired feature again: https://wiki.inaturalist.org. Details here: https://forum.inaturalist.org/t/adding-useful-id-info-to-taxon-pages/657/8
I’ve also experimented with putting content like this on the forum (https://forum.inaturalist.org/t/identifying-common-orbweavers-from-the-underside-wiki/275), but I found that editing this kind of content on the forum is awkward compared to doing it with wiki software. The forum interface is just too optimized for creating small replies in a longer thread compared to editing a single large, complicated page. There’s no one thing I can point to that’s critical, it’s more of a long list of little things which collectively make the experience painful. E.g. the edit button is at the bottom of the post and you have to use the forum’s custom scrollbar to get to the bottom of the post quickly, anchor links to a section in the middle of a large post don’t work due to lazy loading of content, visiting the thread sometimes sends you to the last post if you’ve already read everything once, the thread is automatically locked after a certain amount of inactivity, the editing area is 1/4 of the screen by default instead of the full screen, etc., etc., etc.