I don't think that's happening.
But the whole rock'n'lock/outward cant that has been taught for decades was also taught to me, then I took Craig's class and it became apparent how much more thought out his approach was.
The attached image is from an Instagram ad for a local instructor whose centerpiece class is about arms length gunfights. I've taken a different class from him and he's a nice guy with decades in the military and law enforcement, which I do not have.
Where is his center of gravity? How would this play out if he was shooting a non consenting opponent? This class is being taught to departments all throughout my area.
Maybe it's a great class, but it's a strange photo to choose for your ad.
I guess the gist of my comment is sometimes stuff is taught because that's the way it's always been taught, and nobody thought to question it.