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Sega consoles used the ABC/XYZ left to right format. If you assume X and Y are axis, then X on the left (horizontal) and Y on the right (vertical) makes more sense than Nintendo’s Y on the horizontal and X on the vertical.
I’ve never figured out the reasoning.
I mean it kind of, instinctually makes some level of sense to me. With nintendo’s stuff, the A button is on the right, and the B button is on the left, so you’re reading it right to left, instead of left to right. Hence, the accompanying swap in X and Y.