Something that's been picking at my brains...

[Shimmy]

I too cringe when I have to use flatheads or even Phillips.

A big thing I like about allens is that no pressure is needed to use them.
Although a decent fitting flathead shouldn't need much either.

I get why Phillips might be better than flatheads in some areas but I hate them just as much, they look tacky, need more pressure, can be easy to strip and just a general PITA.

Square or Torx would be nicer still I think, should be even harder to strip (even with low quality tools).

I spose for flatheads and Phillips, a lot of people will most likely have 2 or 3 drivers, and it's possible to use these 3 for almost all screws.
Compare that to allens where there are a lot more needed, and that's only for one measuring system.