let me ask you a question. How much extra mass would be required to collapse the universe shortly after the big bang before life could be possible?

our universe contains 10^80 baryons. If the universe contained 10^21 more baryons, which is an extra 1 part in 10^59, the universe would have collapsed before life was even possible.

how much mass is in 10^21 baryons? well, the mass of a single baryon is 1.67^-27 kg. If we multiply this by 10^21, we get 1.67^-6 kg, which is 1.67 milligrams, or, about a grain of sand

so, to summarize it, the universe, if it contained an extra grain of sand's worth of mass, it would have collapsed and life would never have gotten started.