To me, that is backwards. No one applies the same logic anywhere else. Can you think of any other situation whereby we insist some word, let's call it Florgleblorp, has true meaning, even though none of us can define Florgleblorp, and that we need to do further scientific research and discovery in order to learn how to properly define Florgleblorp?
It's just strange to me. We invent terms to describe things that we already know exist, we don't start with terms that contain no meaning and then go out in search for meaning. That is bizarre.