Independent of history or whatever, it’s unnecessary to have 360 degrees in both axes. You would end up just wrapping around and having duplicate coordinates for the same place.
Imagine you’ve got a sphere you want to wrap in a blanket. The blanket has to be the circumference of the sphere in one axis (to go all the way around), but only half the circumference in the other axis (since it only has to reach the top and the bottom, at which point it will meet the blanket from the opposite side). The orientation doesn’t matter, anyway you’d do it you would need a rectangular blanket that’s twice as long in one dimension as the other.
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