This is very interesting. It's self-hosted and therefore not reliant on someone's brittle/invasive business model. I'd consider switching over to this in a heartbeat if it could handle attaching arbitrary files to notes (e.g. office docs, pdfs, etc.) that would also get sync'd. I haven't looked at the code, but can anyone say something informed about the sync server auth and transport security? Is it running over TLS…
Native integration is better, but file:// + syncthing could probably suffice?
Native solution has an advantage of being able to resolve edit conflicts on a very granular level (individual notes, attributes etc.)