Ultimately, someone has to be in control of who is or is not part of that decentralized network that is the registry. (Or, alternatively phrased, how are you preventing me from saying "I'm part of the .crypto registry, totes.")
Aside from that, the root nameservers is still an entity that is controlled (by ICANN, specifically).
Ethereum is an unpermissioned network. Anyone is free to join or leave at anytime.
>how are you preventing me from saying "I'm part of the .crypto registry, totes.")
The registry would be a smart contract. There doesn't fundamentally need to be an owner.
>how are you preventing me from saying "I'm part of the .crypto registry, totes.")
Name resolving doesn't have to be done by ICANN's domain name system. You can have alternates that do not depend on centralized servers.
And even if I'm a super genius who's written my own full-stack operating system on my souped-up speccy, I'm still bound by the laws of information theory. If you need information that you don't have, you're necessarily requesting it from a source (here, a computer) external to you (here, outside your control). A complicated network protocol doesn't make that fact go away, and doesn't allow you to ignore it. (It might mitigate various censorship or spoofing approaches, but you only know that if you check: the abstraction won't save you merely by virtue of being an abstraction.)