Well, OK, but a certain level of assured "ownership" is beneficial to everybody. Twitter handles, email addresses, mailing addresses, phone numbers, etc., would not be very useful if Twitter, ISP, postal service, telcos, etc. frequently exercised the right to deny access to previous users at any time.
Seeing how easily GoDaddy handed over the domain, it seems one can't even own a domain properly, and that is supposed to be a lot closer to an "ownership" right than Twitter handles.