Wow. Lots of people forgot the Israelis carried one without one in the chamber. Betcha they got in more gunfights than anyone here. It's not how I carry, but I'm not going to throw stones if that's how someone is carrying and they've trained for it. I'd wager a quality class would open a LOT of eyes/expose a number of people's thinking in general.
I would wager you won't find a single trainer anywhere that would advocate carrying without a round chambered. There are just way too many scenarios that would result in your death if you didn't have a round chambered, and plenty of videos online to back that up.