Comment by ozim
I don’t see it you missed the context or I miss something.
Multiplayer documents are real time synchronized and since they are documents that’s totally not use case for DB synchronization.
All the tools are for offline to online data synchronization. Different use case than document.
Not really, the fundamental problem shared for all the tools mentioned by GP is the same of concurrent edits. We as an industry typically ignore it in regular CRUD settings due to low conflicting operation frequency, but it gets problematic in offline and multiplayer settings since those cause it to become more common/visible.
As for documents vs DB, technically you can often compose documents into a number of tables. And having it decomposed into a regular DB simplifies a lot of visibility tasks since you don't need to built an extra layer to manage that and/or you might want to implement partial permissions into something that feels "document like" but really pertains to a larger system.