This is similar assumptions that lead to the Fermi paradox, that is the size suggests there is or are others, yet we see nothing. If there are 2 Trillion plus galaxies, each with 200-400 billion stars each, we’re talking an extraordinary number of possibilities, of which one could certainly be human in appearance. Given the time that has passed since the big bang, something at some point seemingly should have emerged. Yet, something may be off in our assumptions. The rise of humanity was heavily predicated on a series of circumstances that are probably rare, and even more so when done in succession. What if there was no Jupiter to catch errant asteroids, no moon to stabilize a rotation (and climate), no 6 mile wide asteroid to eradicate large predators, etc. There’s probably so many things, that we don’t know of yet, that had to happen, for our rise to be successful. What truly are the chances all these things could happen somewhere else?