[puf]

firebaser here Completely agreed that we should do a better job in documenting the security rules. They're very powerful, but a huge paradigm shift for most developers, one that is too easily ignored (at your own and your user's peril). We've already released a bunch of improvements on the documentation, and continue to work on adding new documentation, video tutorials, and console improvements. Please keep telling us where we can/should improve security rules further though.

And yes, also agreed on needing a solution for presence system, either in Firestore itself, or separate from it.