This is why we close in the gap of self-defense and "illegal in matches" by practicing the most realistic form of kumite. Unfortunately, we all can't fight like in the Sabaki Challenge or like MMA but I believe sparring is an important aspect for self-defense. If you practice self-defense in lieu of sparring, I'm fearing your training may be for nothing almost. In class you have all the time in the world to do the counter wrist grab, counter choke, etc. and you can say "Wait, let me try that again" in class. Are you going to say that to the person holding a knife to your throat, or someone about to tackle you? This is why, practicing self-defense against a very non-compliant partner is important because it gives the feel of realistic training. In sparring, getting hit lets you know what pain is like. Unfortunately in Kyokushin Karate, no punching to the head is allowed, but our teacher is an avid boxing fan and occasionally has us train in boxing and to add, I do boxing at college. Ever get hit in the head? It sure destroys your timing and your attack plan. Sparring also teaches a person to be aggressive. I hope when you have that adrenaline pumping on the street like in class, you know what to do with it. Trust me, getting attacked by a flurry of punches and kicks sure changes the outcome of your self-defense moves your sensei taught you.