Just a counter datapoint, the Firebase comparison is what got me to click on the link and check it out. I'm a huge Firestore fan... here's what would get me to try something new:

- Better user permissions, ability to actually see my users and user permissions in a UI

- Better ability to choose conflict resolution logic

- Tied to that, ability to get "patches" from the server... right now if a change happens in my Firestore document, the server sends the entire document to the client. I'd love to be able to get a patch with just the changed data (and of course send patches to the server too, which it looks like you would support).

- Join queries to save me from needing to do multiple client -> server trips. If it's SQL I'm guessing you would support this.

Very interesting project! I'll be following your progress.