I'm seeing a lot of people here claiming that the Philips head was originally designed to cam out/strip to prevent a transfer of force sufficient to twist the head off. While I agree this does sound logically plausible, I could find no reference to such features in the original patent: https://patentimages.storage.googleapis.com/0f/28/e3/3e3075abbb9779/US2046837.pdf 🤷♂️
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I agree. The vast majority of people don't know the difference, and have never used a pozidriv driver with a pozidriv screw. It is a vast improvement imo.