[Turing_Machine]

> When you learn how to drive a car, you can expect the same standard across all cars.

Across all cars. Not "across all controllable artifacts" or even "across all vehicles" (driving a bulldozer is way different from driving a car).

An optimal user interface for (e.g.) an accounting package is extremely unlikely to be the same as the interface for (e.g.) a video editor.

For that matter, imagine attempting to drive a car by picking the things you want to do off a menu with a mouse.

It would suck.

Big time.

"Ok, now open the Speed menu and scroll down to 'brake'. Now go to the 'slam' submenu item... whoops! Sorry, kitty!".