I wonder why this kind of screws are not more popular? Is it really that much harder to produce them or there is some other reason for not being used everywhere? You can use them either with flathead or Phillips head screwdriver, looks like win-win solution?
I tend to see these:
Or these:
Though I’d prefer Torx or just plain Robertson (square)
I’ll add few more here, in case someone wants to know how some of the screw heads mentioned look like.
In your diagram, what is the difference between “flat head” and “Philips head”?