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The flat head has the torque at the outside, but there are only two points of contact, and it is very susceptible to cam-out with deflection angle.
The phillips has four points for strength and alignment, but the rounded ends are also susceptible to cam-out deflection.
The torx square profile seems to have solved all the above.
The Robertson only has torque in the center, and a square shape is not far away from a circle..
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Meanwhile other things are still happening.
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