Philips x heads were once the normal thing and posidrive didnt exist. Now its the opposite way around. Build a PC? All either posidrive 1 or 2 or hex screws.
And now the hex drive (allen head) screws are beginning to be used in place of any type of cross head screw. Because those are just better. And better suited to use with electric scredrivers, automation, impact drivers etc.
When I repair laptops, hobby stuff like RC transmitters even the self tapping screws are hex/allen drive. And I have a full case of household screws used for shelves or brackets or cupboards etc that also are now all allen heads.
Why better? Dont slip. Transfer torque without having to push... And they line up the screw with the tool so easy to start it straight or begin its "journey"...
Allen head bolts or screws do not slip, get rounded off or fail either. Unless you use crappy soft low quality tools, or you are clueless in your application. I use nothing else today. And replace things with allen heads.
https://duckduckgo.com/?t=ffab&q=small+ ... -Audio.jpg