I use Nextcloud myself, but if people don't want to host a server or fuck with syncthing, they can sync it however they want as long as they use a strong enough master password/phrase (which they should be anyway.).

Is there a proper syncthing android client now, after the official android client was discontinued?

Yeah, it’s not an uncommon use case to accidentally or even intentionally edit the database on two online devices - I do it all the time when I want a new login to be used on my laptop right after I signed up for some new website on my PC, and the laptop just happens to have an “unpushed” change from last evening, or I edit the new login’s metadata, or whatever.

With this, I’d have to keep a mental model of the versioning of each database and avoid even touching my phone like the plague if KeePass is open on my computer.

It’s not that big of a deal, it’ll probably be a problem once every few months, but it’s annoying to keep track of and worth talking about.

Sharing passwords between groups of people so everyone always has the up to date version. Not breaking the world if two people try to modify the same entry as some file syncing solutions do.

Parallel creating, reading, updating, deleting password entries by multiple users.