I am suggesting that Earth may not be as perfect as many people tend to believe. M class stars are really too small to have planets far enough away for them to rotate, k stars are bright enough to have a life zone where planets could still rotate and a larger planet than Earth could maintain liquid water further still. better plate tectonics, stronger magnetic field, thicker atmosphere. Earth could be on the lower edge of life friendly planets.
Oh yeah, other life, I doubt that other planets would be colonised if we get controlled fusion going.