If you're exploring the phone system and want to know what circuit you've happened to sneak your way onto. It's very useful if you can have the phone company just tell you what part of their systems you're calling from :)
If you treat security like a mathematical problem [1] with no grey areas, you are going to reject almost every security measure and say "that would only give users a false sense of security."
Just about all security measures can be worked around by a determined attacker. That doesn't mean you stop using them.
The linked page says to hide your whois information. This is surely security through obscurity. Yet it can vastly reduce the number of reset emails you get.
[1] You should treat crypto like a mathematical problem.