I mean no ill here, but OP's interpretation of darkness is wrong, and that is out of question given wording from lead rules designer Jeremy Crawford on multiple occasions.
Darkness, much like Fog Cloud, is used to equalize situations. There are many situations where an enemy would have advantage against you (maybe you're facing a Berserker with the Reckless Feature, or an enemy with Foresight). In those situations, you cast darkness and equalize the field. Since advantage and disadvantage cancel out, you screw them over. And you also prevent a bunch of spells from being cast inside the area.
