... "Positions for Muzzle Aversion by Gomez-Training.com" ...
Thanks for the link to the short video. Relevant comments and well reasoned perspectives.
He made some astute observations regarding the same primary issue I've always had when the SUL started making the rounds, which is the severely broken wrist and it's disadvantageous position & reduced control in the event of a retention range confrontation where deadly force isn't either lawful or practical.
Potentially "pinning" the support hand behind the weapon (under the wrong circumstances & if the timing of an event goes wrong), probably isn't optimal, either.
Neither is having the weapon's muzzle deflected inward, because it's the direction least defended against in the presence of a "gimped" wrist angle.
SUL with a handgun isn't the same thing as resting the dominant hand on the pistol grip of a rifle/carbine or shotgun being carried slung centerline.
I've used situational variations of what Gomez referred to as the "interrupted drawstroke" position, meaning with weapon placement running to different heights against my body, but keeping the master hand's wrist in a position of strength & control. Some flexibility and the ability to flow in response to the dynamics of real-world circumstances (which can become unpredictable, fast-paced and fuzzy) isn't a bad thing to explore during realistic training (conducted by experienced trainers, for safety).
Some FoF & Sim/FX marking cartridge training scenarios can reveal how events & their timing hardly ever go the way we would like to expect.
You know, much of the circumstances and body positioning, balance, kinesthetics, etc involved in handling, moving with & using hand held weapons (and protecting them) ... (as well as positioning bare hands & blades of various size & configuration) ... isn't unknown in the realm of martial arts. I've always thought of it as working to adapt to using old skills for accepting & employing new technology (guns).
I'll grant that my perspective and opinions on these things have been heavily influenced by having been involved in the arts since '71, but only having been a firearms instructor since '90, so I already had some notions of adapting movement and "technique" from the martial arts to guns.
I'll teach what I'm asked or told to teach, and I certainly keep a variety of approved techniques available to use for folks of varying experience, skills, physical size/strength, kinesthetic awareness, types of firearms, etc.
I always find it interesting to listen to other instructors and their experiences. Quite often, when it gets right down to it, we tend to agree more often, on the more critical priorities, than we disagree.
Not surprising. I saw much the same thing among instructors & senior practitioners of any number of different "styles" of martial arts. Then again when Defensive Tactics was becoming an evolving field.