Nostr would be much stronger with a feature that lets me encrypt notes so only trusted people can decrypt them, with those notes appearing naturally in the feed of approved mutual followers. That feels like the missing piece. I do not want to post photos of my kids or share my location publicly, but I also do not want to manage a dozen group chats just to share them with friends and family. And I don't want minor personal updates, like what I am doing for dinner, to become another interruption in a group chat people have to read through to follow the actual conversation. In a feed, people can look if they want to, and ignore it if they do not. That would make Nostr feel complete.

I’d imagine you can use private relays for that…

Yeah, but that doesn't scale well because everyone needs to run a private relay. And security is weak because if the note is shared it's not encrypted. Not many clients let you post to a specific relays only easily.

I’ve always thought clients should handle pgp keys so we could share pgp keys with certain groups and then just encrypt certain notes and clients would just automatically decrypt those notes if it had the proper keys… Then we could have different pgp keys for different groups and just blast everything out in the wild…