In my opinion because of two things:

- The inherit benefits of having one protocol that apps can agree to and build for.

- The fact that relying on one identity means that even if the centralized server runner goes away, for whatever reason you still have access to your data, and you can still create more data.

If this is paired with a community building software that encrypts all data before pushing it up to nostr and stores it locally, then you have the best, uncensorable, private and unstoppable tool for communities.