[kevinjahns]

Yjs is exactly that. It is a simple abstraction for building any kind of collaborative application. It has ready to use solutions for most problems related to this problem space. The selective UndoManager, for example, is generic&configurable and can be reused for all kinds of stuff. It supports many different editors. It supports many different (scalable) backends.

It is much more than state synchronization.

If there is anything missing, then let's work on it. Yjs is extensible and allows for custom features that others can reuse.