Nostr needs a white-label community client. Something where I can set it up, point it to a domain I own and configure a group id. Then, when any of the members of my community come to the site and try to join, they are set up with a real and valid nostr key but everything is opinionated to hide that from them a bit. They're automatically joined to the group. (pending admin approval)

The client would then show only posts from members of the group. They could then see things like calendar events, marketplace stalls, group chats, live streams / videos all restricted to their group. (unless they hit the 'all' button)

This would make it easy to set up a community around a specific topic and hand-hold the less-technically-savvy to get set up on the community site. It's only when they go to some other nostr site do they realize that it's already picking up their information from this group and then they can start learning about nostr as more than just a thing for their sugar glider breeding community or whatever.