In some cases, it is true. Many martial arts are divided into many styles, associations and organisations. They're split into different ideas and philosophies. And in this day and age, on of the popular uses of martial arts is for sport and competition. With rules and safeguards and things you don't get taught because it wouldn't be allowed in a fair match. Some martial arts, or even just specific clubs, keep a focus on it's original use - self defence. In my club it's a pretty rounded approach, we practice everything that could be used in competition. But the bunkai (application) is always explained and demonstrated for nastier techniques and especially in Kata. Also, we have visiting instructors, one being a street-application specialist who focuses ENTIRELY on life/death situation tactics and mentality. Things like knuckles to the trachea, upward palm to the nose, fingers to the eyes, attacks to the groin(purely as a quick pain-fuelled distraction in some cases), joint-breaking techniques etc would have no place in "sport karate". But considering Shotokan was devised as a means of dropping multiple opponents in as few attacks as possible, these sessions seem to draw out the true purpose of the "sport". But yes, there are clubs/arts that have been "adapted" and changed for sport purposes, such is the price of popularity.