"Major concerns that count against the presence of life are related to the closeness of the star." I think the 'major concerns' are that we don't exactly know

"Major concerns that count against the presence of life are related to the closeness of the star." I think the 'major concerns' are that we don't exactly know what 'life' is, and that since we have no information about any other 'biological entities' such as ourselves anywhere else, we can't entirely assume that it's a common thing. I suggest that if we find life out there, it will be very common. But it's not entirely plausible that this is the case. It's an interesting statistical game, made very difficult by the fact we don't fully grasp how 'we' became in the first place. I mean, we have the gist of it, but there's so much that remains unknown.