Cutie Nicol asked Frank Gun to screw both her wet holes - esskia.com
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When it was originally invented, the Phillips screw system was a vast improvement over the slot system that was standard at the time, with better grip and self-centering. Many more secure systems such as torx and robertson have been devised since the invention of the phillips, as well as revised versions of phillips: PoziDrive and JIS, used in Europe and Japan respectively. They both have less tendency to cam-out. Many industries have moved away from phillips to torx, hex, or other newer standards. The answer that first occurred to me is laziness.