Interesting idea:

A very basic Nostr client that has a system to integrate new modules transmissible over Nostr, a NostrOS if you will. Users create their very own custom client by installing features on top of their base client, which can be turned off at-will.

Want a social graph feature to help you discover more people? There's a module for that. Want a TikTok-like publishing experience? There's a module for that. Want a marketplace? There's a module for that. Want skins and themes? There's a module for that.

For most of my time as a web dev, I've been building as much as I could in an extensible manner, so this might be my opportunity!