Maybe BookStack can do fine for a company with a few dozens of employees. But Confluence can handle tens of thousands of employees. So I wouldn't label Bookstack as a Confluence alternative. Maybe I'm missing something, but BookStack doesn't even have a notion of "teams" only roles. You can't give permission of a file to a user, only to all users who have a certain role. But I'm certainly biased as I'm building a rea…
Most wikis are terrible at evergreen notes: the only one I can think of that might be moving the ball forward is Athens Research though I wasn't able to get their self-hosted beta running and I host dozens of other services with Compose.
Obsidian might be good too, but they don't seem too keen on supporting large business collab usecases even though enterprise is a cashcow.