While distance between keys (in this case ctrl and B) is one factor, it's not the only factor. The position of Caps Lock is just to the left of A, which is part

While distance between keys (in this case ctrl and B) is one factor, it's not the only factor. The position of Caps Lock is just to the left of A, which is part of the home row on a QWERTY keyboard, while depending on hand position, control is much harder to get to. I know the curl required for my pinky to engage Control is less comfortable for me than the slight shift to engage Caps Lock.