Techniques are all about percentages. What I mean is that there are things in Martial Arts and fighting that are probably going to work, things that are possibly going to work and things that are totally illogical and don't make sense.
You are not going to do 10 moves on a persons body if there arm is left straight out after punching or grabbing them. This is because of simple body mechanics or autonomic reflex reaction. This is gaps in logical teaching, nobody stands in place during a fight it just does not happen. Remember that a fight is a living thing. Having said that, you should learn everything you can related to fighting because then you can evaluate and you never know what will work and what will not.
Nerve strikes and pressure points, the biggest of the absolute techniques that will work all the time (so the experts say). If you think pressing on a certain part of the body will stop a fight, then you have never been in a fight. Drugs, alcohol, pain resistance effect the percentage. I have been taught in Police Work pressure points over the years and I have used them as much as pepper spray, NEVER! I have seen Officer's get tunnel vision trying to use pressure points and then wonder why it's not working. It works perfect in a contained, controlled situation, but the percentage is very low in the real deal. I still recommend learning them to know the body and be educated to make an informed decision.
What increases percentage fighting success, live training and working hard. Still never overcomplicate moves. We try to stay away from that in BDJJ, but we still learn some of them. Direct, simple attacks tend to be more successful.
Peace...