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"What does BitTorrent Sync do that rsync cannot?"

It seems to overcome NAT and dynamic addressing very well. All you need is to distribute the small shared secret once (for example, offline via USB, paper, or via the first letter of every headline in consecutive college newspaper publications), and you have the ability to transfer files (and do anything that can be boiled down to that; ex: chat, perform backups, publish videos of cats among your friends, distribute mostly static data between front-facing servers, etc...) without further coordination (for example, constantly renewing a DNS record, overcoming NAT, and keeping SSH or FTP permissions in order). Sure it may not be the best experience for all use-cases from a UX standpoint, but it is very general and, being serverless, it is better from other perspectives. I'm not boxing with you, only responding to your "?" and advocating for more such software.