The backstep is the fastest, most efficient way to turn your hips into an opponent and off balance them. It is an attack. It is NOT used as a way to "move around the opponent."
Further, once you have done it, your feet "uncross" themselves, because you are going from facing one direction to facing the other way.
Cross-stepping as a way to move around the opponent gets you foot-swept, hit, or shot on, or (fill in blank).
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