Thank you to whomever submitted this. My main annoyance is that when I want to go to a subdomain, I'll typically start typing foo.domain.com, but now the browser sets it to www.foo.domain.com. Annoying.
Let me clarify: since the subdomain is hidden, I now have to munge with the URL input field to just get the full url to show up so that I can then modify the subdomain.