I've got answers to the questions on the first page.
Why don't they use better steel? I, personally, don't see anything wrong about their steel.
Why have their designs changed so little over the past __ years? They don't need to change! The design is excellent.
Why don't they offer different blade shapes? They do.
Why are their tools so slick in the hand? I'm not so sure what you mean by that, maybe it's the oil?