Nostr is decentralized and censorship resistant, but the majority of the world doesn't care about these features until they need it. 

Nostr has a value for value economy, but the majority of the world doesn't understand the concept or use bitcoin yet.

Nostr has a portable digital social identity, allowing you to be in control of your digital social identity for the very first time, allowing you to take your entire social graph with you, every time you use a different application from Nostr's ecosystem. 

In general, at BTC Prague, while explaining Nostr to people, the digital social identity route was what clicked with the most people. From there, it's not a long stretch to understand building a reputation and web of trust either. These are all powerful points that people understand and use in their everyday lives.