They aren’t.
Hexagons are, a la honeycomb. A quick YouTube search will yield some cool videos about the geometric reasons for this, with practical examples.
The universe itself seems to prefer spheres. Spheres have maximum surface area to volume ratio.
Each shape has properties. It is a fun rabbit hole to go down if you care to learn about the golden ratio, Pyramids, resonance frequencies, Greek dudes using sun dials to calculate the size of the earth, navigation by constellation, on and on.
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