I agree with all that you’re saying philosophically.
I’ll make two physiological comments, though.
Even mechanical fundamentals require sensory feedback. Proprioception and sensory fibers.
Not everyone is equally endowed with the neural capacity to achieve this to the same level. Even with practice, there is a significant difference in the level of athletic achievement that is possible.
You’re in a special situation where your former life, especially when young gave you a very robust proprioceptive network.
If you don’t learn it and develop the networks when young, there’s a limit to how far you can get later.
It’s like music. If you learn it when young like a language, you have brain maps you can never learn even with “training and practice” if you start later in life.
So even though you started later with shooting, you already had a very close association with your hand proprioception to bring back to your vision.
Also, going to disagree that people with difficulty accommodating near vision will ever see irons on their handgun as well as a distance focused dot on an optic.
Just like someone with severe neuropathy in their hands will have a hard time point shooting.
General vs. specific proprioception is an interesting issue. Maybe it's all general? Then I guess you would be right. And certainly you know way more about that than I do. I would say playing music is probably more important than athletics. That's incredibly valuable for a child.
What I'm saying on near accommodation is that it's almost unnecessary for performance in practical shooting. Yes, it's very helpful as a developmental tool for noobs, and it definitely has helped me. I also can't put the paste back in the tube, so not sure how I would have reacted as a noob with bad vision.
But I do know how it feels to have vision that's significantly deteriorating as my shooting continues to improve - specifically in the manner being discussed here. And my sense is that vision loss is actually helping my shooting, by making it harder for me to do things I shouldn't be trying to do in the first place.
So I would say, try setting up a single plate, maybe a 12 inch disc at 7 yards. Make ready, and study the disc very carefully with max visual focus and detail. Hold that focus and present the gun in the foreground. Allow yourself to become minimally aware of the sights, and see how much awareness you need to be sure they are on target. Then try breaking a few shots, a few splits, a few draws.
Still at 7 yards, see how high you can get your awareness of the sights without changing your focus on the plate. Then relax your acuity on the plate, but keep accommodation at that distance. How does that affect your awareness of the sights? Try equalizing your awareness of plate and sights. Is that more secure?
Then try reversing, so accommodation is on sights and awareness is on the plate. Is that better or worse? Does it allow you to call hits more confidently? What about time?
After getting a feel for that, move back to 10 yards and go through it again. Then 15, 20, 30... maybe 50 yards. See where you need to make changes to get the best efficiency, and where maybe you would be more efficient if you could do things a bit differently.
Steel Challenge is a great example. Shoot through the whole match dry and live. How many plates do you need to go to a sight focus on with irons? Is it the same in dry and live, or maybe you are more confident in dry?
And also, throughout the range on the single plate, how does modulating attention to trigger press compare with modulating attention to sight picture? That's one thing that changed a lot for me. In the first few years, it was all vision. I misunderstood Benos in that respect, and in retrospect I think that might have been his intent. Like the idea is to keep everyone hooked on vision until each individual gets to the point where they can drop the leash...
For me, shooting with target focus and max awareness of sights in foreground is enough to get most of it done. There's no mechanically possible rate of fire where I can't see the fiber cycling, and for some targets I need to pull back to sight focus, and even see a crisp lift. But even in those instances, attention to trigger press provides more security than attention to sight focus. Former is how I get it right. Latter is just how I see that I'm getting it wrong.