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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While it is theoretically possible that there are other forms of life that don’t require water, we have no idea how to even begin looking for those sorts of theoretical alien life forms. We do know how to find signs of water, and that water is key to life on Earth. That gives us a place to start looking.
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