I like it how the author says how busy he is and how he finally snatched a few minutes out of this busy life to bring us this edict: don't hijack mouse pointers, or else!

What next, don't use blink or marquee elements?

Or else!

Standard issue cursors are not that great in all environments, sometimes making the cursor massively big or doing other daft things to it make sense. It is all about context and golden rules don't help.