I agree. In theory you need to just distribute serialized patches but in a real world backend scenario you may need to integrate with knowledge of current document state, user identity, and possibly even some level of access control.

I’ve wanted to use Y.js with a Go backend multiple times but gave up each time due to time constraints as it’s hard to find simple reference implementations.

I’ve been checking back over the years but it still seems hard to do this outside of Node.js.