How? Isn't that essentially adding and subtracting from the most significant to least significant? Could you demonstrate why it's simpler with an example? 1532 - 879 will be adequate.
EDIT: To be clear, going from left to right is not inherently 'easier' but it would be more consistent with our direction of writing.
Over time we all realised that big-endian systems (IBM, 68k, etc, and our native western languages) were a hack and we've moved to little endian systems (intel, arm, DEC, ...) as sane