interoperability for one. Makes it fairly trivial to move notes between apps. I tried out Obsidian because I could just copy my logseq markdown files over.

Way easier to backup for most people

I just run the wiki in docker and take regular snapshots?

I also find the requirement "have internet" is a good trade-off against the requirement "install client on every device".

How is docker easier for most people? How does docker even work with multiple devices? Mobiles? and how much storage does a docker-snapshot wastes?

snapshots aren't that big. A wiki server just runs on a single server? I thought it was pretty common among the HN population to have a cloud note solution. Syncing files seems more hassle than a one-time docker setup.

A database isn't a markdown file.