I often wonder why the typical keyboard keys are staggered such that symmetry is not mirrored for each hand. The top row is shifted slightly to the left of the home row, which means your left hand fingers reaching outward travel a different distance than your right hand fingers reaching outward. Combined with letter placement, the left hand usually has a lot more to do than the right.
The bottom row is much more symmetrically positioned, and yet has the fewest letter keys.
The bottom row is much more symmetrically positioned, and yet has the fewest letter keys.