Rob, we teach combatives not martial arts. One of the reasons is that it is very effective while being easier to learn. We tell the students you still have to practice it to make it work, but since it is distilled down to many fewer "caveman" techniques, it is much easier to learn well enough to make it work. We then have them practice it against real resistance. I always make the point that even though this is simpler, that DOES NOT mean you don't have to ingrain it through practice. To me this is the same whether we are talking knives, hands, guns, whatever. There is no answer for the truly lazy.
Fair enough. The problem is that the alleged benefit of requiring less training gets oversold. It's possible that what we've got here is, failure to communicate.
Moreover, the marginal training requirement for learning better, more efficient techniques is much less than people think. Probably because "trainers" intent on defending their lowest-common-denominator curriculum have to make the alternative look expensive, overly time consuming, and difficult. They seem to have that messaging down, as you can see looking through this thread: "If I had tons more money, I'd train like an 'athlete"' or "If I had hours every day to practice..."
The fact is none of those are true. This isn't quantum physics, or advanced capoeira. It's simple gun handling.
To put a number on it, 3 months or so of 2 reasonably well designed, 30 minute dryfire sessions (which cost NOTHING) per week should be enough to get just about anyone to get to roughly USPSA B class/IDPA Expert class level gun-handling skills. That's about the level where 2nd nature responses are the norm, give or take. Shooters below that level more often than not responding immediately to whatever happens, no matter many or few techniques they've decided to learn. They just don't have the quality reps put in.
It does NOT take hours every day, or thousands of dollars to train more efficient techniques.