I don't think we are really in disagreement here.
The context of my commentary on stance really is geared toward competition shooters (thus the reference to top action pistol shooters, split times, and transition times). In the competition world, the tiniest fractions of a second matter.
As someone helping a new shooter, I have never been one to push THE stance or THE grip or whatever. So many people believe that one or another is the preferred way to go and is the only answer to the solution. I'm not like that. However, there are certain facets of shooting that will ultimately allow MOST people a greater level of proficiency with less effort.
When the weaver stance is applied as it was originally designed, the recoil impulse is supposed to be tamed through active muscle tension of the push-pull of the strong and support hands, respectively. The isosceles, however, allows the shooter's body to be more relaxed -- allowing the recoil to get soaked up just as a byproduct of the body as positioned. It's far more symmetric and keeps the sights tracking straight up and down with little effort.
I look at it this way. If someone is trying to learn how to use a keyboard for the first time, they can hunt-and-peck all day, everyday until they are really, really good at it. And for that person's purposes, that might be sufficient for whatever they hope to achieve. However, if they choose to put in the work to learn to type "properly" using all fingers, they will probably ultimately reach a greater level of typing speed.
After all, if we just tell newbie shooters to shoot however they want by going with whatever is most comfortable, then what's the point of teaching them anything. We can just hand them a gun and say "be comfortable". I know this is an exaggeration, but I think guiding someone in the direction of what will give them the best chance of success while still keeping their goals in mind is generally the best way to go. To me and many, many others, this is the modern isosceles.
Most of this argument is academic for a majority of shooters anyway. As is the case with a lot of different aspects of shooting and firearms ownership, a bulk of the conflict about the minutia only takes place on internet forums.
