-> The other probability is that much of this is assembled using
-> automation and once they are tooled up to use a certain
-> fastener why retool for a different one. It is also a pain to
-> stock and inventory multiple types/sizes of fasteners. 

 Torx is the hot ticket for automated or Fast Assembly. The bit stays
engaged until lthe screw is seated. As a matter of Trivia Ford Motors
Invented the "Clutch" head screw, Looks like a butterfly, because they
wanted a fastner that was better suited to assembly work. They mostly
used it in Door Hinges and other High Troque aplications were the
tradiontial Phillips and Straight Blade tools would slip out. Adn I
believe the Reed and Prince and Pozi-Drive versions of the standard
Philips were also developed to assist in power driving.
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