I don't think a nostr specific browser will solve content, user and nostr's discoverability through traditional crawlers and spiders. Then there is the matter of "duplicate" content which technically is everything on nostr since every client basically shows a duplicate of content received from relays. Nostr content is simply not being indexed by the engines.

Test it with searches like "The Grinder nostr" for example.

Thus content discovery is at this point almost non-existent for the average person searching the internet. Odds of them finding nostr outside of our circles are very low to non-existing at this time.