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I know your question is only meant to illustrate a fun fact, so here goes an attempt at a rational reply & observation, also just for fun:
It's more difficult and relatively costly to make a round container, e.g. a box.
Since the art of pizza dough creation requires a spinning motion, pizzas of course are round. The most efficient way to equally portion a circle is to cut with straight lines that intersect at the middle.
The resulting portions resemble triangles only on two sides.