Well if you can answer both X and Y, then in the case they really wanted X the answer is helpful, and in the case that they overlooked Y, the answer is still helpful. I'd say that's wrong less than either X or either Y
Sure. But cost/benefit; you can always spend more time and effort making a better answer, but at some point life gets in the way. And sometimes you're not up to answering X.
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Well if you can answer both X and Y, then in the case they really wanted X the answer is helpful, and in the case that they overlooked Y, the answer is still helpful. I'd say that's wrong less than either X or either Y
Sure. But cost/benefit; you can always spend more time and effort making a better answer, but at some point life gets in the way. And sometimes you're not up to answering X.