Why can’t we just figure out what screw -head- shape is the best and always use that. It seems pointless to have hundreds of different screw types for very similar things. Obviously this is excluding things like lug nuts or anything heavy duty.
Edit:specifying screw heads, not the threads or shape.
In: 0
Emyrssentry gave a great answer about the ways there can’t be a Universal “best” screw, because the “best” design for cost will never be the “best” design for strength (how hard you can torque it without slipping), with may or may not be the “best” design for ease of use. So depending on what factors you care about, which one is “best” changes. That gives many different head designs a legit reason to exist.
**However,** I want to add that [there is also a lot of this happening.](https://xkcd.com/927/)
(To other commenters: Yes, that’s the relevant XKCD).
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