So lets say you can draw and shoot with good speed and have shot placement where you can land multiple shots right over the center of the heart in an area that has the diameter of one inch so that your shots would just about be landing on top of each other. Now, lets say you could be a little faster and land your shots in the same spot, over the heart, but now your shots are wider so that they cover an area that has a diameter of three inches. You are still hitting the heart and lungs but by speeding up a bit you sacrifice some of the pinpoint precision that allows you to land your shots all within a one inch diameter. As for me, I would rather be a little bit faster and still be able to hit the vitals. That way even if the bad guy is a bit more accurate than me I will shoot him first and I will hit him in a spot that will hopefully stop him before he is able to get off any shots at me.
Moving to cover, or just moving period if cover is not available, is vastly more important.
The only thing that stops instantly is a CNS hit. It doesn't matter a whole lot if your hits score 1/10th of a second faster than his. Return fire sucks and return hits suck more. You don't need to be "faster" you need to be "fast enough." You don't need to be "more accurate" you need to be "accurate enough." Fast enough and accurate enough for what? That depends on the circumstances.
If you put 6 bullets in the heart it still takes time for the bad guy to die. Dying ain't dead. Dying people often don't know they're dying. If it takes 15 seconds for a person with 6 bullets in his heart to keel over (it'll probably take more, but whatever), how is being 1/10th of a second faster going to help?
Statistically, it seems to take about 3-ish seconds on average for trained people to react to an unplanned stimulus and draw from concealment and put a shot on target. For very skilled and experienced shooters, that can be cut down to maybe 1.5-ish seconds. Unless you get a CNS hit the 1.5 seconds difference between the very highly skilled and trained and the pretty well trained and practiced is still well within the time period that a dying-but-not-dead bad guy can still be operating. How much time and effort went into cutting that 3 down to 1.5 which might potentially have been better spent building other skills from "suck" to "OK" instead of expending the effort on The Law of Diminishing Returns building a "good" skill to "amazing?"
According to research done by Active Response Training, if you don't move in a gunfight you have an 85% chance of being shot, and 51% chance of being shot in the torso while if you move and shoot you have a 47% chance of being hit, with 11% chance of taking a torso hit, but if you move to cover and return fire your chance of being shot drop to 26% with a 6% torso hit rate.
So instead of spending time working on cutting your draw time down by a fraction of a second, practice moving (preferably to cover), drawing on the move, and returning accurate fire while on the move.
A lot of studies and after action reviews indicate that even people trained to shoot two-handed will frequently draw and fire one-handed while under stress, so spend time doing one-handed shooting (while moving to cover).
Peace favor your sword,
Kirk