Community development.

Unless you are speaking specificially about changes to nostr itself as a protocol, you don't need to worry or fight against censorship because it it built in. Reddit is a great community model, i think that nostr can have shades of gray when it comes to community participation which is more fine grained from what Reddit allows.

Walls help bring evolution because communities develop in safety and isolation from external influences - you don't need to look further than your backpyard to understand how niches enable specialization and flourishing.

Being on nostr, all this is opt in. Is a community/relay to strict/lenient for your liking? Go somewhere else. We don't need to be completely mixed in, and socially that's actually a way to really stirr up internal conflict - throw in individuals completely unaligned with the core ideals of a communtity to co-opt and break it apart from the inside.