well, since no one knows how much sands out there on this planet, how dare the experts say the numbers of bitcoin address is greater that all sands on earth (or dust over the universe )? How they come up with this conclusion?
It is simple logic. It is not that the sand and dust have no numbers, but the number is beyond human comprehension. So also is the number of bitcoin addresses. It is not endless, yet the end cannot be comprehended by me and you at this point.
So it is just a logical way of telling you not to bother to imagine the numbers.