A usual reply is that physicists don't or shouldn't care about metrics of the size of the universe but rather the simplicity and symmetry of physics. After all,

A usual reply is that physicists don't or shouldn't care about metrics of the size of the universe but rather the simplicity and symmetry of physics. After all, the universe might well be infinite without many worlds, and why do even we care about amounts of stuff? The library of Babel doesn't contain more information than any single book in it. Similarly, pointing to specific areas in a large universe may require adding details.