I’m gonna back up Matt on this one. The reason is that you are making an assumption here that can be false. That is to say that a BJJer or MMAist (or whomever) will exclusively study ‘sporting’ methods with exclusive sporting limitations. As a comparison using TMAs, is it the assumption that all who compete within sponsored kumite matches, say within karate, will endeavor to only practice those techniques allowed in the competition? Why would one think those only practicing BJJ or MMA would simply practice only sporting elements?
However, what one can compare between use of techniques, when looking at opponents, is how well they deliver them. And further, what constraints does a particular competition put on those techniques? For instance, if we just examine a punch….how is it different in application when used in competition, or for real in a defensive situation? The answer when you examine it is that there is no difference. The way you train application is how you will apply it, regardless of the circumstances to use the technique.
As far as using more sophisticated or dangerous, disallowed techniques….this is an up in the air question since they are not allowed. But they are not allowed in TMA sparring as far as I can tell either. And the justification for technical ability even within TMAs has been in sparring application up to the point of their ‘deadly’ use, and that is the same as MMA or any of the modern, sporting arts. Just that they seem to have a higher, proven record against TMAs in that arena.
Again, I personally don’t believe it’s the technical repertoire of any system, but more a way of training them for use.