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They are not machined as a true hex I am guessing. With fasteners and tools there is a +/- tolerance, with a slight gap between the max of the tool, and minimum of the socket. So when you turn the tool, only the very corner of the hex touches the fastener. Now imagine with the tool turned, you filled the angled gap areas, just to the center of the flat. Turn the tool the opposite way and repeat. Now you would end up with a tool that has 12 sides. It wouldn't fit in the screw. The only way it would fit would be to dish out the area between the corners. Basically, each point would not be machined at 60°. This is all just hypothetical, as I never tried to reverse engineer one.I'll never understand how those "hex+" work any better than a typical hex. If the screw head was shaped to fit the hex+, then it would make sense, but on both, the contact is at the corner only and whether the entire face of the edge is touching or not, just seems like it would end up with the same result.
That is just the only way I can think of that this would work, while remaining in tolerance. In theory, it would be possible, but just guessing here.