For your information I train and shoot daily.
I was referring to training by instructors in realistic, lawful defensive shooting. That is not something that one does "daily". You are referring to
practice.
Practice is important--provided that you are practicing the right rhings.
Lawful defensive shooting involves very rapidly identifying a rapidly unfolding, imminent attack from ny quarter, drawing quickly, and shooting quickly and rapidly with combat accuracy.
An imminent threat--one in which the attacker has the ability and the opportunity to seriously wound or kill,
and the defender has reason to believe that he is in jeopardy---is most likely to materialize at close range, and by the time the defender has drawn, will likely involve shooting at a distance of two or maybe three yards.
The attacker can be expected to be moving at around five yards per second. "Hitting the bullseye" would be nice, but a better goal is to achieve three to five hits, or more, with combat accuracy--in a second or two. Think in terms of a small pie plate, moving fast.
I have no idea what you can do, but your assertion that one could reload twice with speedloaders during a lawful use of force incident would indicate that you have not thought it through realistically.
Consider this: if you draw when the attacker is seven yards away--which should support an argument for imminence--you will likely start shooting at just few feet.
To hit something critical in the body is a matter of luck, and more fast shots increase the luck.
Speedloaders would likely be of little use before the threat has dissipated, when continued shooting would not be lawful.
To be able to handle an active shooter situation is not a bad thing, but it is surely the least likely of all potential use of force situations.
One other thing, and this has been discussed here at length. Carrying a revolver that can be fired double action entails some serious risks. I had the hammer on my SP101 bobbed, and I later replaced it with a six shot K6A.
