This is a really weird way to characterize the situation. Frankly, I'm pretty confused by what you're trying to get at here. "Light mounted pistols, Active retention, A large opening at the top of the holster"
As opposed to what? Isn't that what any professional that uses a firearm going to use in terms of general characteristics? What law enforcement or military holster isn't going to be like this? Are you insinuating that a light mounted pistol in an active retention system holster, with a large opening at the top makes the safety concerns about the sig pistol illegitimate? What holster uses a small opening? I think you're trying to say safariland SLS without saying Safariland SLS but I don't understand how that alleviates the problem? It almost seems like you're trying to shift the blame to the holster, but I could just be misinterpreting.
Did you see the part where I said the p320 needs a trigger safety dongle? I don't believe that 100 percent of the cases against Sig are legitimate cases of defective pistols- I believe that at least some are the result of negligence and or foreign objects in holsters. Below I show proof of other brands of pistols discharging in holsters via human fingers and other foreign objects depressing triggers, so we know it happens.
Many of the objective observers to the p320 story are still waiting for a single case, even amongst the 100+ p320s alleged by lawyers to have defects- of a provable defect that causes repeatable self discharges, but observations have noted the following:
- Uniformed officers rather than plain clothes, are the most likely p320 users to have lots of stuff hanging from their bodies that can get tangled in holsters such as keys, wires, straps, clothing cords & toggles. This has happened and has caused unintended discharges with ARs (one is on video, officer was in a retail store responding to a call of man with gun) and pistols to include most of the popular LE brands.
- Uniformed officers rather than plain clothes, are the most likely to fight with a suspect, which can result in debris getting into holsters- fingers, twigs, stones, gravel, etc, while those same officers often have to quickly reholster, sometimes without looking, while suspects are not completely immobilized.
- Uniformed officers rather than plain clothes, frequently, but not always, have lights mounted to their pistols and those lights require a bigger holster with less positive "lock in" of the pistols while holstered- it's a known design issue for WML holsters that most of the major holster makers, Safariland, Alien Gear, Blackhawk, etc., have been working to improve upon and some of the newer designs have reduced those design compromises especially the large perimiter gaps. See links below about holster design issues.
All of those above variables combined could and have contributed to issues with p320s and other brands of pistols, but more so with the p320, probably because it doesn't have a trigger safety unlike all the other polymer striker pistols used by US LE.
Holsters aren't impenetrable vaults:
Uniformed officer at a school in Minnesota is speaking to young kids in a classroom and one small boy reaches his finger into the officer's duty holster and depresses the Glock's trigger causing a discharge in the holster
https://www.foxnews.com/us/student-fires-officers-holstered-gun-at-minnesota-school
Holster issues
Holster issues
Holster issues
S&W M&P unintended discharge in holster, likely from the belt buckle
Glock discharges in holster during struggle with suspect
New Orleans PD's Glock 22 accidentally discharged in holster during struggle