When I was a hand finisher, I would make high-speed steel and tungsten carbide "knives" very specific to the job at "hand". Due to the production nature of the work, the edge, handle, hand, and body, had to be integrated as nearly as possible into a "single" piece of machinery. On many jobs I could not afford to think about how these pieces fit together - they had to perform together on a nearly unconscious level.
I expect nothing less from my hammers - the handle, weight, balance, and striking profile must do what I tell it to as second nature.
Those of us who have been delighted by fine craftsmanship and "intuitive" design, may be on to something.
Robert Taylor