I dont think anyone did an analysis on this. But a local database is an absolulte requirement for many clients right now. We are all already duplicating downloads and duplicating disk space. This is besides the fact that we all developing our own databases separatedly, which is a huge waste of time compared to centralizing the development in relay apps.  

Then there is the offline use case. I believe most of our event writting will have to operate off-line. And the app must find each other events if that is the case. Otherwise users will just be super confused.