Interesting article, thanks for the link.
The one point he tries to convey is meaningless, IMHO, “Dress around the gun” vs “dress for the gun”!
Most of the folks on this forum that I have read, who work in NPEs, choose the gun best suited for their dress. A good example in my opinion would be @10thmtn , he doesn't "dress for the dual LCPs" he carries them because that's what his dress/environment allows. Two LCPs wouldn't be his best choice for all situations in life (he's stated here before he carries a larger pistol when he can), but for him, they are the best choice for his NPE. Maybe I really am dense, but “Dress around the gun” vs “dress for the gun”! amounts to the same thing.