[Aeolun]

True, but we probably don’t actually need enough bytes to address all the atoms on the surface of the earth a hundred times over.

[Dagger2]

Good! If we did then we should've made it bigger.

We don't know exactly how many address bits we're ultimately going to end up needing. Our only options are to go for "too big" or "too small". Giving how much effort it takes to deploy a new IP protocol, we should err on the side of having too many addresses rather than too few.