I think we're actually saying the same thing. I guess I look at shooting stances and grips much more abstractly than most. Fluidity and dynamism are what is important in shooting competitively or defensive shooting (or all aspects of life really). I just look at all of these awkward shooting positions one might find themselves in, be it shooting from retention, supine around a chair, side prone under a truck, or doing a hard lean standing on one leg WHO in competition to be an extension of a base isosceles stance and thumbs forward grip.
Honestly, I think the best stance is to be beyond stance. What I mean by that is we have a basic stance that provides the most advantages with the least drawbacks, which from a pure shooting perspective is isosceles, and then we need to adapt that to reality, be it a competition or defensive scenario. Watch OIS videos and you will never see someone in an ideal stance, watch a top level GM shoot a USPSA stage and they are never in an ideal stance. If we want to advance our shooting skills in any arena we need to be proficient shooting from any stance and any awkward position we may find ourselves in; we use no-stance instead of stance.
As I said I am pretty sure we are both actually getting at the same point so you probably know everything I just said; I just think it's important to flesh these things out for new shooters that might stumble upon the thread so they can at least be on the right path to a grounded and fluid perspective on shooting. Thankfully, I think if a new shooter reads both of our respective posts they will come away more knowledgeable.
This post reminds me of one of my favorites quotes...
Before I studied the art, a punch to me was just a punch, a kick was just a kick. After I'd studied the art, a punch was no longer a punch, a kick no longer a kick. Now that I understand the art, a punch is just a punch, a kick is just a kick. - Bruce Lee