Er, I suspect the reason is that people forget that you can do that with atan2. (You can't do that with a normal atan, IIRC...)
In any case, yes, it is a little silly.
Warning: Unless otherwise stated, code is untested. Do not use without understanding. Code is posted in the hopes it is useful, but without warranty. All copyrights are relinquished into the public domain unless otherwise stated. I am not an angel. I am capable of error, and err on a fairly regular basis. If I made a mistake, please let me know (such as by replying to this node).
