As far as myself, the rub with the safe action trigger on the
Sigma is it only works if the snag/pull is in the middle, or on
the upper section of the trigger. If it's on the lower half of the
trigger, it can be pulled full range and fired.
This is why I often carry with an empty chamber, even though I'm
using a holster that covers the trigger fairly well.
But I'm in a different position than many guys. I'm not carrying
concealed, and the use of that pistol is mainly out at my dirt patch.
It's almost purely for mean critter use, not for crooks.
It's the branches, limbs, brush,etc that I'm constantly tromping though
that bother me.
I'm afraid that some day one might get poked in there, and then
come pulling back out, and a branch off the branch might catch and pull
the trigger.
Like I say, the extra second or two to rack the slide is nothing to me
out there, so I prefer to take the safe route to assure that no matter
what happens, the pistol is not going to fire.
Sure, I may be overly paranoid, but I would rather lean in the direction
of the extra safety.
I've been shooting for 40 years or so, and I ain't never had an accident
yet.. Bang on wood.. I'm trying to keep my record intact..

BTW, in this case, I do blame the holster and user, and I consider it a
ND, not an AD. It's no fault of the pistol.
And yes, in my case, the pistol is a Sigma, "some would call it a
Smegma", :/ and not a Glock. But they are pretty much the same in
function. The trigger itself is a bit different between the two though.