I think this is misunderstood - everybody points out that how evil BMW is for trying to be proprietary, then immediately points out any Chinese factory can produce a compatible tool for pennies - which one is it?
I think this is a pretty good mechanical design in general because:
- large contact surface (like hex or torx)
- no chance of slide-out (like flathead) or torque-out (like Philips)
- you can use a different size screw bit than the screw, and it wont slide around, or destroy your nut like torx does with hex
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