Your example seems to contradict your premise, since you can't drive screws with a nail gun and you can't very quickly drive nails into wood with a screwdriver.

Your example seems to contradict your premise, since you can't drive screws with a nail gun and you can't very quickly drive nails into wood with a screwdriver. Actually, your example seems to suggest that although there are actions that any tool can perform, there are tools specifically designed to perform certain actions and so no other tool is better at those actions.