True, life has been found in far subzero temps and in water near boiling, but the planets they are finding have surface temps in the hundreds of degrees meaning that they have no water. No water means no life.
BTW, one of the reasons why the larger planets are being discovered first, is because of their size and the fact most are close to the star they are orbiting. Our current instruments/technology pick them up relatively easily, as opposed to a smaller planet orbiting at a much greater distance.
My bet as technology advances in this field, the smaller, planets orbiting these stars at greater distances will be discovered and cataloged.
In fact several hundred planets smaller than Neptune have already been found.
That’s for us and life on this planet. Who’s to say water isn’t poison for some extraterrestrial species?