If you are ever attacked with a weapon at combat distances the "draw" gets your defensive tool into play [the game].
If you excersice a slow draw you may not be drawing at all. If you can't get it into play you can't use it.
If you can't use it why carry it to begin with.
Even with firearms, the presentation to ready is paramount to getting into the game of defending yourself.
Actually you don't NEED to emphasize rapid knife opening in your defensive roles at all. You could just stand there and take a few hits while slowly deploying any of your defensive tools whether they be gun, knife, asp, keys, etc.
The emphasis should be on tactics and tehcniques which can keep you in the game and hopefully survive. Of course tactics and techniques are unnecessary if you don't have the tool in hand when the fun begins.
Altercations with aggressive perps threatening you with a knife can often be nuetralized just by presenting your own knife. They would rather rob/mug/hurt someone else who is less apt to defend themselves by being unarmed than one who has instantly produced his own defensive tool.
As most perps will have their weapon in hand already, we start behind the curve and must somehow attempt to gain back the disparity created by being unarmed against another who has produced a weapon of some kind.
I would prefer to fight knife to knife instead of relying on unarmed defensive skills. I'm unarmed until I put something in my hand with which to defend myself with.
If presenting your defensive tool while being attacked in a timely manner [ as soon as possible upon recognizing the threat to your life ]was not important we would would not need to carry defensive tools.
In a life and death situation, the faster we negate the disparity of force the better the chance of surviving the encounter.
You pull a knife on me as I look like a victim easily preyed upon and then I produce a knife instantly, you may just figure that I might know a little something about a knife fight.
In another instance where the deployment of the tool was essential to negating any more injury---------
A small boy has fallen and caught his shirt sleeve in the bottom of the escalator and is "pinched" tighter and tighter as the material is being sucked into the treads disappearing into the floor. Screeeming, yelling like he's being killed, one steps forward deploying the folder and instantly cuts the shirt away thereby freeing the boy and preventing further nerve, muscle damage and possibly long term disability.
The paramedics would have arrived within minutes but the outcome for the boy would have been very different had someone waited longer than necessary to extricate him from that situation.
The tactical folders market has always looked for faster, easier ways for someone to deploy their product once taken from it's resting place. If there were no need or demand for such equipment we would not be seeing the genre of folders with various features which CAN get it into play when required.
If you never need the speed thats fine. I like a tool that gives me the option of a quick deployment. It may mean I live or die. I like to err on the side of caution and be prepared as mentally and physically as possible. To have it available immediately if needed is important.
I can fill both hands instantly with knives from both sides if necessary. If you pull on me and I produce [ "pop" ] two instantly from my pockets you are going to have to rethink your game plan of assaulting me. The "pop" scares the hell out of people when just being shown. They do not expect you to have the ability in a blink of an eye to produce a readied defensive tool. They have never seen it so it can't happen and they are lulled into a false sense of security thinking they have the upper hand which is instantly negated by the "pop". The element of surprise might even be enough for them to rethink their intentions and backoff to go to someone else playground.
No offense taken
Brownie