I quite agree! We already have debating societies notably the House of Commons. What AB is basically for is supplying answers to unknown questions. The answer can be fortified by additional details but not by prittle prattle.
Panic Button makes the good point about it being seriously annoying during exams...
Of course, these questions were always counterbalanced by the supposedly blank pages at the end stating "There Are No Questions On This Page," or even more amusingly, "This Page Has Been Left Blank."