[dns-operations] Dumb question: why is it that some registries limit the nameservers that can be delegated to?

[Stephane Bortzmeyer]

On Thu, Sep 11, 2014 at 07:52:31AM -0700,
 Colm MacCárthaigh <colm at stdlib.net> wrote 
 a message of 26 lines which said:

> So why is it that name servers need to be registered? What's the
> benefit of doing it?

As an employee of a registry which does not require name server
registration, I wonder, too :-)