I don't think it's really that complicated. You have various factors in a physical altercation. For the sake of this conversation, we'll abstract them down to three: 1) Level of contact. 2) Range of techniques. 3) Allowable targets. Assuming that a full-out fight is defined as one featuring full contact, anything goes, and any target is fair game. Agreed? Boxing: Full contact. Punching. No targets below the waist. Lethwei: Full contact. Punching, kicking, knees, elbows. No groin or eye shots. MMA: Full contact. Punching, kicking, knees, elbows, throws, takedowns, etc. Limitations on targets consistent with other ring sports. So... MMA features more variables (albeit not all of them) present in an actual fight. Now the question becomes, "are any of the limitations present in this format also present in your classroom training?" Unless you're kicking the crap out of each other in groups with real weapons and no protective gear, then yes, they are. As I've said, training has rules. It's all well and good saying that the real thing has no rules. But for many of us, our direct experience (i.e., training) DOES.