I suspect this would be a good 'substitute' for documents that are often hosted on internal wikis.
[1]: https://github.com/oxidecomputer/rfd-site
[2] https://rfd.shared.oxide.computer/rfd/0001
[3]: https://oxide.computer/podcasts/oxide-and-friends/2065190
But if you were shopping for one, from the standpoint of keeping the docs working being able see missing pages and see incoming links to a page are both pretty helpful. I kinda miss the latter.
If you have a small team, Obsidian and a syncing solution like git or obsidian sync might work.
I was able to work with my company’s it team to set up a wiki which is only accessible from within the network, including by vpn, and is hosted on a vps.