The opponent can just as easily strike one's unprotected left shoulder though.

Also helpful when storming a tower; spiral staircases are generally spiralled to give a right-handed defender the advantage against a right-handed attacker

But as long as neither you nor your opponent plan to fight in formation, it's all good! This "fighting in formation" thing probably isn't going to catch on.

unrelated but i also found it to be an advantage in table tennis