Do you believe one steps should be usable self-defense in of themselves? Or it is merely to teach technique and physical mechanics?
As a further question, do you believe the one steps you use right now align themselves 100% to the goals you have for them?
I see the one steps as a learning tool, one stepes teach the student to develop timing to defend him/her self and counter or finish the bad guy. Can be one steps be used to defend ourselves? well it depends. In my short MA life I've seen a lot of techs including one steps that are arcaic and not practical from the real self defense we need these days and I want to give you an example.
Some time back in my kenpo class I saw how a brown belt perfomed some disarming (handgun) techs very flashy but some how this guy always got rid of the hangun!!!! I mean he threw it away!!!! OMG I looked this and just ask him.. Hey, can I ask you why you threw away the gun and don't use it to keep the bad guy at bay? This brow belt saw at me in a particular way and answer me:... well.... that's because that's the way we practice here the tech.... Oh boy!!! I just shaked my head and ask him to show my tech.
I performed a tech I learned from some kind of krav maga and afther the disarming I took the handung and performed a tap and rack drill (I hope you know what this is, I performed this drills tons of times when I was a practical pistol shooter) at the same I time I yelled very clear and loud to the other guy GET TO THE FLOOR M....FU.....R!!! while I was aiming him. The class just get scary about my yelling. Then I returned the gun to the brown belt and told him: THIS IS THE WAY TO DISARM A BAD GUY. Why not use his weapon to subdue the m..... f.....r??? The one who has the weapon is the one who has the power.
Well this brown belt didn't get it, he returned to his old fashion way to disarme the guy, I just hope he will never have to disarm a tough guy on the streets.
Sorry for the story, let's get inside your questions back dancingalone.
My own one steps (not necesarily the ones my sambunim teaches) and self defense techs are not 100% realibles, I mean they are 90-95% realibles inside de dojang that is a controled enviroment but in the streets, high in adrenaline and fear the human body can respond in very weird form, nothing is 100% for sure, however even with this one steps and self defense techs can be very handy and useful if need it and can make the diference beetwen death or life.
Manny