Path of travel.

It's what levels the playing field... more of it tending to be the equalizer for those who are NOT ambidextrous.

Gross motor skills can be achieved with either extremity, but fine motor skills are best achieved with the dominant hand.... especially if they need to happen fast.

The greater the radius of travel, the better the uncoordinated hand can follow that exact path. Gross motor task. Think big ol' spinning reel crank.... or a saltwater conventional reel with an even bigger big ol' crank.

The smaller the radius of travel, the harder time the non-dominant hand can smoothly trace that same exact path of travel. More of a fine motor task. The smaller short-radius cranks on baitcasters fall into this category.