I'm really not sure where you contradict me. The subject was high volume body building style routines, and the merits of intensity over volume. You don't seem to address this. I guarantee you no fighter trains anything at all like a body builder. The focus is on hand speed and explosive force. It is an absolutely proven fact that high volume and emphasis on maximal force training compromises speed and endurance. The low reps and plyometrics you mention have nothing to do with body building routines...

I don't think anyone would suggest 30 minutes twice a week would lead to overtraining. That's a pretty good target, actually. Most people trying to get fit sort of half ass it five days a week, though. I'm not sure over-training is the right word, but they definitely spend way too much time training.

But as far as training 20 hours a week, that's far in excess of any health benefits, which was my point above with regard to not modeling on athletes. Competition level training involves major oxidation and over nitrification stress. Hormone profiles are messed up. Pro and college level athletes are not doing their health any favors.

I will have to disagree with your claim that getting cut is necessarily about aerobic exercise. Aerobics can certainly help, but another way lower fat is via boosted growth hormone. That "oh I'm going to puke" feeling you get from brief intense training is surging growth hormone levels. It makes you nauseous. It also reconfigures your body to be lean.