This is a good example. Most in LEO, Corrections, Executive Protection and other such professions don't take training beyond the academy and in-service yet they still, by-and-large get the job done. No, they aren't Bruce Lee. But they normally get the job done with the little they know, without sparring and normally just practicing repetition by rote.
WWII combatives is another example. No sparring. Stupid simple. Very little training initially. Yet it was gross motor skills that were retained in long term memory and flat out brutal and effective.
So it goes back to the OP, sparring is not important (or necessary) in a traditional Karate system if the focus is SD related.
Sparring was a big part of what we did, certainly not the only part, but definitely the most enjoyable. Sparring sessions were always the most crowded of nights/days, there was an electric atmosphere every time, people rooting for others, fist pumping and cheers when someone landed a beautiful kick, combo, sweep of what-have-you. It was jut flat out crazy fun. But I ponder if it was necessary for the development of our students. I like to
think it, was, but that's more than likely a selfish way of how I look at it.
In police work, beside the times when we happen upon a crime or an incident, for the most part we are called and sent. We don't really have the option of
not dealing with problems, avoiding them and going about our day. Constant repetition of these cases builds our skills in the various ways we have of dealing with them. Now, a private citizen, often times has the option of avoidance. He can get outta' Dodge, or avoid it all together if he's lucky - and that's a beautiful thing. Most times he'll never be forced into testing certain skills he might have that deal with conflict. Also, in our case, we have right on our side, we have the law on our side. (let's hope so, anyway) I believe that gives us a mental edge in all conflict. An edge the regular guy doesn't have.
So......I still wonder if all the sparring we did, constantly, the sparring I taught......I wonder how necessary it really was. I think it was more important for some students than others. Maybe for the more introverted ones, maybe the less athletic ones, maybe for the ones that never had physical altercations, maybe for the ones who were bullied more than the rest of us. Maybe it gave them the opportunity to experience a mild form of violence, and how to deal with it, in a safe and supported way. Maybe it taught them that they can survive taking a couple of good shots, maybe it taught them how to get jammed, or knocked of base, and how to reset, regroup, re-whatever, in a fast paced pressure environment. And maybe not.
Hell, I don't know. I think I'm driving myself crazy with this.