I personally wonder why we need a central registry system at all. Couldn't we just use a DHT or similar? I understand why it was created this way to a good degr

I personally wonder why we need a central registry system at all. Couldn't we just use a DHT or similar? I understand why it was created this way to a good degree, but why we continue to use this I don't get at all, there have been wonderful practical advances in networking and distributed computing since this was all set up and I can't think of one good reason not to use those advances to make the internet better.