One of our users reported that he doesn't got any notification mails by changed files, altough he's following the community. Following doesn't result in also following on files in the community (e.g. changes on existing files or adding new files).
While I agree that both ways (follow all files/follow none in a community) are not optimal, we should have a way to set this more granular. Some users may want to get ALL events in some (important) communitys. But in others, he just want to get informed about new added files.