I think people sometimes use wanting language strictly in terms of preferences. I think people sometimes have outright contradictory wants. I think people are subject to compulsive or semi-compulsive behaviors that make calling "revealed preference!" on their actions a risky business. The post you linked to (I can't quite tell by your phrasing if you are aware that I wrote it) is about setting priorities between various desiderata, not about declaring some of those desiderata unreal because they take a backseat.