One could argue it's even worse than that (as of now), because e.g. on the fediverse, people publish media to 20,000 different servers/domains, while there are probably less than 50 media servers/domains used on Nostr today. And 90% of files probably live on only a handful.
The spec is a few months old. Servers won’t just be actively censored, people will also get bored or tired and take them offline. The hash is the identity, not the domain. I’m ok if you think it sucks or its stupid, I just want people to consider how it’s intended to be used. It’s not a server.