I don't mean to be a pain in the ass...but w.r.t. to MacOS 9.x (and earlier), this is nothing. Unless I'm mistaken, the default install of MacOS 9.x, the user WAS (the equivalent of) "root" and they had to go out of their way to not be "root". The only danger I see with MacOS X is in people thinking that MacOS X is equivalent to Fort Knox out of the box. Which will lead some people to do things they wouldn't do otherwise.
Just my two bits.
