This meta post is inspired by a specific recent answer, but it's more general in scope.
Let's say someone posts a question asking about resources or possibilities for something specific - as in the linked example, dairies that sell milk but don't kill their cows. Then someone else posts an answer which, instead of directly answering the question, argues (sensibly, with evidence) that it's the wrong question to ask.
Generally, on Stack Exchange, these are called frame challenge answers: challenging the frame of assumptions within which the question was asked. What do we think about such answers on the V&V site specifically? On the one hand, maybe a question really can be the wrong question to ask, and a well-argued answer to that effect can have its value. On the other hand, our whole thing is basically "trying to do X without Y" (to make certain types of food without certain animal products, for example) and not judging each other's choices, so too many answers saying "there's no point in looking for X without Y, because Z" could potentially undermine the site.