Because historically HN favors extended discussion of entire points. Not doing what "everyone does" is the name of the game. In particular, the rebuttal was not

Because historically HN favors extended discussion of entire points. Not doing what "everyone does" is the name of the game. In particular, the rebuttal was not on argumentative parity with Grellas' well-tempered text, mere downvotes don't explain that. So, I agree with Thomas here.