I assume it's the ability to send sats with note anonymously and communicating via lighting address
You can communicate anonymously and privately on nostr without zaps. Give to Nostr what belongs to Nostr, and to the zap (one NIP) what belongs to the zap
You cannot communicate anonymously in public without zaps. That’s extremely powerful.
Better go tell that to all the nyms on nostr. Some don’t even add the zaps, they must have their reasons…