A while back I read a book in which the author went to Japan to learn about traditional kaiseki (teahouse) cuisine. During the course of the book, she learns that the wasabi and soy sauce served with sushi is only there for show, because the sushi is supposed to be perfectly seasoned. So, according to the person who told her that, you are never ever ever supposed to actually use it on your sushi, because to do so is an insult to the chef.
Now, I love veggie sushi. And wasabi and soy sauce and pickled ginger. And I love 'em all together. So, is it really improper to actually use the soy sauce and wasabi? (I generally get stuff like kappa maki, which doesn't include wasabi in the roll.) Or is this just a "fancy sushi" rule? Any input?