Yes, it seems pretty untenable that rare earth is the explanation for the lack of evidence of any life outside of Earth. But even if it is true that we’re the only life in the observable universe, the universe is still much bigger, and in many physicists opinion, probably infinite.
The fact that life seems to have evolved on Earth as soon as it was possible to is some evidence that abiogenesis is not the bottleneck. But the usefulness of this observation depends on the distribution of other things we don’t know. For example, if on planets where life evolves later, life never makes it to human-level intelligence before the planet becomes uninhabitable, then our early abiogenesis is survivorship bias, rather than something we should expect to be in the center of the distribution of when abiogenesis happens on a planet where it is possible.
Yes, it seems pretty untenable that rare earth is the explanation for the lack of evidence of any life outside of Earth. But even if it is true that we’re the only life in the observable universe, the universe is still much bigger, and in many physicists opinion, probably infinite.
The fact that life seems to have evolved on Earth as soon as it was possible to is some evidence that abiogenesis is not the bottleneck. But the usefulness of this observation depends on the distribution of other things we don’t know. For example, if on planets where life evolves later, life never makes it to human-level intelligence before the planet becomes uninhabitable, then our early abiogenesis is survivorship bias, rather than something we should expect to be in the center of the distribution of when abiogenesis happens on a planet where it is possible.