I've seen that point made before and it's a good point, it's not just the moon, but virtually all planets and stars that we can see with our telescopes. Perhaps the only exception I can think of in terms of objects with mass in space are asteroids/meteors but they still kinda clump together is spherical type objects. Even if they aren't perfect spheres they are kinda clumping together.. I don't think the earth is a perfect sphere either, I think it's a "lumpy" sphere and that's what modern science says as well. But I admit I could be wrong, I don't pretend to know everything or be right about everything.