I’d still vote and invite people consider Matrix 
Worth mentioning that events in rooms are stored in a directed acyclic graph not much different from git. Git seems like a good idea but it won’t be very friendly and practical to integrate with for apps, likely leading to commits to the repo be performed by the apps instead of the users. With Matrix we will get similar and many more benefits(e.g. discussions, moderation) still keeping things decentralized, any specific needs not covered by the default event types could also be defined as a custom protocol(e.g. apps doing data aggregations, etc.).
I’d be happy to define the Matrix based architecture as a protocol everyone can implement and since it’s something we already need for DAOs, we can also create the tools/libraries to make integration in existing products easy.