That indeed is a fundamental difference. But on second thought I got confused. Source independence, content addressable are nice and all, but we don't build static websites that always have same hashes; "Ubuntu Server 18.04.1 ISO" could be ipfs://<static_hash>, but even "latest Ubuntu Server 18.04.x ISO" couldn't be that. You still need to query the origin server (or client, whatever you call it), the central authority, to get those addresses. So, frequently changing websites/webapps don't benefit from this; they may even be penalized by the overhead. Only aggressively cacheable objects could benefit, but the vast majority of those probably won't be popular enough to be cached/pinned by peers anyway, so you still end up getting whatever you need from the origin server (or paid CDNs).

Btw, I skimmed through Beaker docs, and it seems they resolve names through DNS (what else can they do) and even use HTTP for discovery.