[rotorwrench]

Reed & Prince went heavy into aircraft grade fasteners before Phillips ever went that direction. Now days it all going toward Torx. It's all about putting things together rapidly with self centering tooling. If you work with Richardson stuff you find that they don't center up as easy as the cross recess designs do. It's about the same for clutch head designs. They hold up well with assembly and disassembly but it takes a bit more time to center. I know we're not talking much time but over a long shift, it can add up.

The Richardson square drive and the clutch head design also take a bit more complicated process to manufacture the fasteners. GM used the hell out of the clutch head design for a while but it sort of petered out over time.