Steve
Mostly Harmless
I appreciate the comments, but I think I'd say that self defense schools have rules as strict and well defined as any sport school. When you train full contact to the groin, do you wear a cup? Do you wear padding of some kind.Exactly. No rules, you quickly run out of training partners. I think what he was getting at was no specific rules, aside from, "try not to break each other." More of a guideline, than a code of rules, really. It's all the same, really.
Sport MA says, "don't do this, this, and this," and thereby avoids most really awful injuries. Specific rules/guidelines.
Self Defense MA says, "Do whatever you want, but use control and judgement," and thereby avoids most really awful injuries. General rule/guideline.
I think it's fair then, to say that Sports have rules, and self-defense based training has guidelines. But they're both really the same thing. There's also a great deal of overlap between what is sport and what is self-defense. They're almost the same thing, in many cases. Which is why arguing that one or the other is the more effective becomes so silly...
You mention that you use control when sparring. Is there a time when it's okay to spar without control?
When you are training a technique that you know is dangerous to a particular joint, do you ever break the joint? Is there ever a time when it's okay to break a training partner's wrist?
Those are rules.
What I think you guys are getting hung up with is that some styles have created a formalized, competitive ruleset and some have not. But rules are rules.