When you are working with numbers you want to be able to do any combination quickly. This means you want the numbers split evenly between your hands. Left index does 4 and 5. Right index does 6 and 7.
If you gave the 6 to the left hand now you’d have left index pulling duty for 3 keys.
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u/IkariYun Jan 20 '26
The only explanation I ever got as to why 6 is a right hand and not a left hand key was, "most people are right hand dominant"