Why flathead screws haven’t been completely phased out or replaced by Philips head screws
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Two different issues here.
1) Why is flathead still around? It’s *very* easy/cheap to make (both fastener and tooling), it can be good for high torque, and it’s the easiest to improvise a tool for.
2) Why Philips? Philips has only one useful property…it’s self-limiting on torque. This is useful for certain kinds of automated assembly and basically nowhere else. If you’re not going to use flat, literally anything other than Philips is better about 99% of the time. Philips should die.
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