Yes, I dove with some of your bretheren, I have youtube and I can read. Get over yourself. It's 3 valves.
I'm kidding, of course I don't know... how could I know, I haven't studied the art of valve management it under a gue instructor.
The point I made was that the OP can practice whatever they want without any downsides... going diving and spending time in the water is what makes a good diver and you can learn new stuff.
I get it, if they only had been gue trained, it wouldn't have happened... or if they had any better training.
That quote could literally be from a cult... I would make a solid wager that there have been plenty of cults who used that phrase.