Except no human ever has had equal capabilities in all of those areas. By putting them all in one bucket, it means they don't successfully model anything real. As such, it doesn't make sense to try. Rather, what Dexterity models in D&D are exactly those things it modifies. That's it.They have been watered down in many ways, but IME they actually can cover every thing, if properly and broadly defined, comprised of multiple elements.
Dexterity, for example, throughout the editions includes these elements:
In 1E: hand-eye coordination, agility, reflexes, precision, balance, speed of movement