I've addressed this in other threads (or was it this one) with Steve, I think. There are many ways of preparing for physical defense. MMA is certainly one, but there are a lot of people who aren't interested in that one. My program is one of the other ways. I'm not sure it's all that much longer as a path. I teach some very simple and direct pieces right up front, then just keep adding to build skill and add options. I accommodate a wider range of people (and commitment levels) so I move more gradually.
How many times have I actually replied to you that we DO spar. We DO spar with resistance. We do striking sparring and randori (like rolling in BJJ), and even combined sparring/randori. There are some techniques we don't use in sparring/randori because they aren't safe with full resistance, so we leave them out. Those who bounce use what's appropriate to the situation, just like we would in self-defense. Just like the LEO's do.
That's not the only reason. There are a great many things that will work quite well against someone who doesn't understand grappling very well, which will fail spectacularly when used against someone who grapples. An "okay" striker (reasonable power, form protects hands, speed is decent) will often be sufficient on the street, but will be easily outclassed by a faster or more powerful striker (who has trained harder) in competition.
You appear to want SD-oriented training to be awful. I say that because you keep presenting false dichotomies and strawmen. When I tell you we do things you say SD systems don't do, you keep coming back and ignoring that (reference your recent comments about not sparring, not training with resistance, etc.). You seem to be (and I'm using that specific phrase, because if that's not what you intend to be doing, I'd like you to be aware of my perception) trying really hard to prove something about the efficacy of MMA. As I've said to you and others, there's little argument to be made that MMA preparation doubles as SD preparation. It could be taken a step further to be more prepared for the street, but so could anything else, so that's not a mark against it. But MMA isn't for everyone, and other approaches have reasonable evidence that they are effective. There's no need to win here.