Right? The question is, is a completely useless Martial Art, still a Martial Art? (if there ever as such a thing.) Or, how far do you need to go in the direction of uselessness, before a Martial Art simply becomes Dance? Or, even more interestingly, how far must a Martial Art go in the direction of utility, when it ceases to be a Martial "Art", and simply becomes martial.
along these lines, this is Jigoro Kano, the inventor of modern Judo (and the belt system that Karate adopted). This, the portion where I linked (1:40), is impossibly beautiful to me. But, I'm not educated enough to know what these forms mean, in the complete sense of what they do. It would be disappointing to me though to learn (if anything like that were argued), that they are perfectly useless. It's beauty is invoked at several levels: