Earlier quoted context omitted.
We're having this struggle right now trying to replace Confluence thanks to Atlassian's "no more Server licenses" foot-gun. The other wiki software that's out there just hasn't impressed me so far. This one is painful to set up and keep running, that one is awful to edit anything in (especially if you're non-technical), most of them don't support collaborative editing or inclusion of Office doc content on pages, and…
The fact that collaborative document preparation is as troublesome as this in 2022 is a damning indictment on the computer industry. (It's become very good at advertising though.) Douglas Englebart must be rolling in his grave at a comment like this https://www.youtube.com/watch?v=yJDv-zdhzMY
It surprises me that Confluence continues to be the only thing sitting in the middle of those, and while some competitors have started to shyly emerge (Bookstack, xWiki, I think there's one in progress at Jetbrains), nothing feels like it's really aggressively going after the Confluence market-space directly. Given how many people I've seen comment that they're not fond of Confluence but can't seem to replace it (at least, not until Atlassian forced their hand with the server-license fiasco), it seems like a natural space for people to pursue.