Dear me chadz- I said BJJ indicating the sport. You're argument is like walking into an mma class and saying its disappointing cos it isn't dog bros style Kali. We're talking about the sport, this sport doesn't have subs. I practice sambo and we don't practice chokes in sparring but it doesn't mean we don't learn chokes under progressive intensity, chokes aren't part of the sport but they're sometime part of training..
I was almost killed one time when someone drop his elbow straight down on my heart area while I was on the ground. I got back up, suddenly everything in front of my eyes turned into black, and I fell back down. That move works 100%.