I carry two phones, my private Android phone (my personal preference) and an iPhone imposed on me by work. Not having to bother with two sets of cables would be a welcome improvement.
As for "not moving the needle", every little thing sums up. Also, it's not just the cables - manufacturing lines, shelf space, redundant labor, ...
As for "not moving the needle", every little thing sums up. Also, it's not just the cables - manufacturing lines, shelf space, redundant labor, ...