It's a binary consideration if you think of it rather than hexadecimal.

If you have to prominently represent 10 things in binary, then it's neat to allocate slot of size 16 and pad the remaining 6 items. Which is to say it's neat to proceed from all zeroes:

    x x x x 0 0 0 0
    x x x x 0 0 0 1
    x x x x 0 0 1 0
    ....
    x x x x 1 1 1 1

It's more of a cause for hexadecimal notation than an effect of it.