Our ears are symmetrical, so why do hearing devices have L and R on them?
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The same reason that gloves are built to go on the left or right hand; while your hands (and ears) are similar they are mirror images of each other. As a result, you need to create two components that are mirror images of each other to work right.
For hands, you may want extra padding on the palm. Under the “either hand rule” you would need to put the extra padding on both sides of the gloves (so it would be on the palm either way you wore it) or you would need to have and extra thumb so that you can rotate it. This is more work than just saying “this glove is for the left hand”.
For ears, you also have the need to ensure you play the sound from the right direction. If you don’t know which ear is going to wear each piece, you may have sounds coming from the right when it should be the left.
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