Do you mean doing away with the way Nostr clients currently work, that is, subscribing to an npub, and instead subscribe to topics or communities?

Wouldn't that entail the addition of some sort of metadata to all Nostr events so clients can filter and properly display them?

Sounds either like a bitch for users if they have to manually add those labels every time they simply want to shitpost or, once again, the introduction of automated algos to filter and label. That is, opening the door to censorship, shadowbanning, etc.