I'm more than half way inclined to agree with you voyager, BUT for hobbyists like me (you too?) I do see a problem.
Except for certain very commonly used sizes, if I buy a box of, say, 100 or so screws, they will normally last me a long time. And especially when it's for something that must be "undoable" (but for other places too) I absolutely HATE having a mix of different screw head types on the same job.
I therefore find myself ending up with, say, 7 screws of a certain size and head type in a box, and find I need 8 to complete the job!
I'm not sure but would guess the general changeover from normal slotted, to Philips, to pozi, to torx has taken place over the last 40 to 50 years or so. Which means that old codgers like me have loads of "very nearly empty" boxes of all sorts of different size and head-type screws (basically 'cos I'm too tight to throw the "old" ones away).
AND you have the situation in most suppliers, especially those catering mostly to hobbyists rather than professionals (i.e. buyers of the 100 offs rather than the 1000+ offs) where you can't always be sure (yet) that you'll always find torx head screws in the size you want - still just as likely to be pozi.
Finally, one big problem with torx (though it applies to philips and pozi too) is that dried and hardened paint inside the head socket is the very devil to get out if you need to remove the screw. In that respect, the standard single slotted head is much easier to deal with.
Ah well, I guess the totally ideal screw head, AND the ideal simultaneous supply thereof, ain't gonna happen in my lifetime!
But agree basically, so far anyway, torx are pretty good (until the next "sliced bread" comes along). ;-)
