Even in that, you've combined several points. What if the practice methods haven't changed (same techniques, same training methods), but the philosophical approach has evolved or been lost entirely? Or vice-versa? What if it has all the ritual (bowing, uniforms, terms from origin language), but has evolved in every other way? This is what I was getting at earlier with the inherent problems in creating a definition across all these areas. Pretty near every style will have some things on each side. I can't think of any style where everything they do is about fighting prowess - even MMA has things that are common and are more about sportsmanship (touching gloves to start the fight, for instance). We end up with a continuum, rather than opposing ideals.