Well; I spent a significant amount of time with OS.js. I could see Nostr OS being a combination of online and offline tools; Online for microblogging, foto sharing, chatting, streaming and other media consumption (twitch, youtube), forums/communities for finding and asking for help (BB/reddit), whilst the offline part would probably be more focused on local files, documents and stuff. Some might be editable collaboratively, leveraging Nostr as an initialization method to send an invite/link to someone and doing basically a "HTTP 100 Upgrade" off Nostr into whatever that specific product uses (Colabora, Onlyoffice, ...). And all that with a single, simple, verifiable identity.

Well, unless your nsec gets leaked anyway... x) But yeah, those are my thoughts. ^^