I think the proper term is circumstellar habitable zone. If there is other life out there, why are we assuming that it’ll have the same basic needs as our animals? The universe is seemingly infinite, and there’s endless possibilities of what’s out there, so why do we only consider planets that are the ‘perfect’ distance away from their star?
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It’s really just a matter of looking for what we know. There’s a high probability that life exists outside our habitable spectrum, but it makes sense from a resource perspective (ie, money) to first look for life in areas we know for certain can produce it.
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