OP:You have a Glock, right?
Field strip your Glock. Pick up the frame. Push the trigger safety in. You'll notice:
1. The trigger spring pulls back on a Glock. Without the striker pushing against the sear, as soon as you push the trigger safety in, the trigger flies back.
2. In the rear position, the sear hits the disconnector, deflecting down, which moves it out of the path of the striker.
Now hold the trigger bar forward while pushing the trigger safety in. And let the trigger bar back, gently.
In some Glocks, the sear will stick against the disconnector without going all the way down. Depends on how smooth things are. If yours sticks in this position, tap the frame against a table and watch what happens. The trigger goes back a little further and the sear is deflected down. Notice that if the gun was assembled and the slide was actually cycled, the disconnector would be pressed in by the slide, and it would not deflect the sear down; the sear would stay up, engaging the striker as the slide returned to battery.
If you were to drop a Glock onto concrete, and it landed on the back of the slide, muzzle pointed straight up, the striker would cock itself through inertia. If the trigger safety weren't there, the trigger bar/sear would follow the striker and most likely lock in the fully rearward and downward position, completely unblocking the striker safety and clearing the sear from intercepting the striker. The disconnector is not tripped, because the slide is not back. When inertia was done the striker spring would take over, and the striker would have a clear path to the primer. The gun would fire just as surely as if you had pulled the trigger, intentionally.
If you think the 1911 grip safety is there only to prevent you from firing the gun without a proper grip, then you are wrong. It is primarily a drop safety. The Glock trigger safety might not stop certain AD's that could be prevented by a grip safety. But the trigger safety costs only a few cents to incorporate into a Glock, and it's super simple, unobstrusive, and utterly reliable.
Regarding the short Glock reset:
OK. Do Glock shooters find that comes naturally with a little practice?
I find it comes naturally, period. It does not require practice. It's not a secret. It's just how the gun shoots.
And does it defeat the purpose of the "Safe Action"?
No. The purpose of safe action is that when you take your finger off the trigger, the gun is holster/drop-safe. Take the concept of the HK P7 squeeze cocker. But you don't even have to let go of your grip. Or take a DA/SA pistol concept, but in this case the gun automatically decocks itself when you release the trigger. No manual decocker is needed. As soon as you take your finger off the trigger, the gun is inert, in a holster/drop-safe condition. Now, if you were to get in the habit of STAGING the trigger before getting the gun on target, then that would not be a safe practice, at all. And not necessary. The takeup on the Glock trigger is not very far and not very heavy. It's just there to move the firing pin safety out of the way, IMO. Not really to "cock" the gun. The striker spring just happens to be doing double duty in this regard. Why add more parts, when you can just incorporate it with what's already there? It's just a coincidental bonus that Glock can say that the striker is partially decocked.
It does potentially make you UNSAFE on other pistols, though. When you get used to the Glock trigger, and you shoot a gun with a noticeable reset but a much lighter break, you can get an unintentional double.
But if you have just intentionally fired a shot, let's hope your gun is in a safe direction.