Keepass is great at syncing itself and merging conflicts (although I don't know how it works exactly so it makes me nervous), but it requires you to have a shared platform if you want access to it on multiple devices. You can use a cloud, but at least on my GrapheneOS phone and Linux laptop with a desire to use open source code as much as possible, the UX is terrible and it requires user accounts too. Syncthing is supposed to be good, but I never got it to work properly.

I get your point with Keet. I'm also waiting for open source. I also think they are running a large server and that is the main reason why it works smoothly in general. I've used the holesail app and it used to be unreliable, it has gotten better, but I think it is because Keet built out their own servers to make up for a lack of (quality?) participants in the network.