The phenomenon still exists, obviously, in the world of self-loaders. With a hammer-fired double-action gun, one can put a thumb on the back of the hammer to control it as one holsters, but this option is not available for striker-fired pistols without manual safeties. On those, "Being Really Really Careful" is your first and only defense against unexpected loud noises when putting your heater away.
Enter first the "Gadget" and now the Sure-Draw, the latter of which is currently causing some comment on the intertubes, some of which is the usual "I just won't pull the trigger when I'm putting the gun away," and some of which seems to misunderstand the nature of the device itself, apparently thinking it needs to be manipulated to fire the gun like a conventional safety.
Because I hate wasting several paragraphs of content at an Away game, I'll copy it over here, too...
No “squeeze” is required to fire the gun.Right now I carry M&Ps with no thumb safeties. My only protection on holstering is being really, really careful, although I put my thumb on the back of the slide just to maintain the habit. (When I carried 1911s, I holstered with my thumb under the thumb safety and pushing up.) If a device like this came on the market for the M&P, I'd buy three tomorrow.
You can operate the pistol as though this device is not even on there and you would never know it was. It gives you the option, should you so desire, of putting your thumb on the back of the slide and blocking movement of the striker (or disconnecting the trigger) as you reholster so you don’t Grebner yourself.
I put my thumb there when holstering anyway because A) It verifies that the slide on the pistol is not being pushed out of battery by anything, and 2) It’s a good habit to have if you find yourself for whatever reason carrying a hammer-fired DA pistol as it will prevent a trigger-snag discharge from giving you a racing stripe.
There are guys who carry AIWB and who carry an HK/SIG/Beretta even though they’d prefer to carry a Glock simply because being able to control the hammer with the thumb on holstering provides an added layer of safety against blowing a hole in their femoral artery. A device like this or the “Gadget” would offer them the option of being able to tote the Glock while maintaining that added safety layer.
If someone would NEVER have an ND because yadda yadda booger hook something bang switch, then something like this isn’t for them, since they already have all the safety they need. *wiggles trigger finger like Limey actor pretending to be Delta Force*