And your ignoring his point that is still isn't the same as preparing for "warfare." The truth is, simply "tucking a pistol in your belt" is good for 99.96% of civilian self-defense. Yes, I made that up. But I challenge you to find a significant number of cases otherwise.
And people are still fine to carry extra mags (and armor, and a camelback, and a compass, and night-vision goggles), but there is a difference between doing that, and telling others that they have to do it, too, or they are somehow negligent.
For myself, I wouldn't find "tucking a pistol into my belt" would give me the survival skills (and mindset) that I feel are necessary to be comfortable (and successful) in a self-defense shoot situation.
I chose to be an asset to society as a carrier, versus an untrained liability that can't take ownership of every round that he/she fires. For the record, I'm not suggesting that training of any kind should be mandatory. I am suggesting that common sense would dictate that proficiency with your hardware would be mandatory.
For me, I find regular range workouts with my pistols, and specialized training that trained me for worst-case scenarios keeps me in the asset to society column, versus the liability column.
For example, if you are in a gunfight, and get shot in one arm. This is already now a very bad day for you, but then running into a weapon malfunction at that point would make the day even worse. Being able to clear ANY weapon malfunction with one, and ANY hand is a worst-case scenario for any shooter. Being able to rapidly respond to malfunctions while under stress I think is pretty essential. People who are not trained, and are unable to fix these types of problems quickly, are less likely to survive a must-shoot situation (in my opinion).
I'd also theorize that untrained shooters, who don't factor in things that are between your muzzle and your target, and things that are beyond your target have more potential for unintended collateral damage if a round misses. A ricochet that goes two blocks away, into a stroller being pushed across an intersection, as an example.
I am not going to be THAT guy.
Train for the worst, and you up your chances of survival in ANY shoot situation.
I wouldn't presume to suggest to anyone what they should, or should not do. As long as the rounds that people fire go where they are intended, we're all good.
I think our military friends are just saying to "prepare for the worst". We never know what situation we might be facing. It could be against multiple threats, in any number of variable environments.
Hopefully, we never have to even draw.