Hard to answer this. Rob seems to say he himself received crappy training, so it is not obvious what it is he passed on to his kids.
I received the bare minimum. Was it crappy? Idk, it seems to be the industry norm. I don't think it was worth what I paid, but I got a card. I went on to forget about cards and learn doubles and a drysuit on my own. I read as much as I can, I get in the quarry and go to 20' and practice until I'm cold or the tank is getting low.
I have some mentors / friends / jokers that I watch when we go diving. Diving with people much better than me helps a lot. I kind of wish @Eric Sedletzky would show up, I think he feels the same as I do. I'm not sure we need a lot of crappy instructions, but maybe better mentors.