Use what you like. I don't find it necessary. Even for a "double tap on that 25 yard target at speed". If I had encountered a problem with a properly lubricated stock unit, I wouldn't hesitate to address it. But if calling someone who can shoot fast and well without the need for aftermarket "fixes" a bozo is the order of the day, tell grandma to hurry up with those pizza rolls, the king of the basement is hungry. I have yet to encounter a glock out of the box that I needed to modify to shoot fast and well. Just because I don't find them beneficial doesn't mean aftermarket gadgets are bad. Good luck whatever you use!
You'd be one the few exceptions then.
Hey, I know some guys who do well with stock triggers, I know a couple of the GSSF Masters who do that.
But as I said before.... you won't see someone with a finely tuned 1911 say, "Let me take my 2 pound, zero pre-travel with minimal over travel trigger system out and install a ****ty 5 pound plug trigger with long pre-travel and over travel". Why? Because the advantage is the lighter/easier trigger.
Now, I never said it's impossible to do well with a stock Glock trigger, but it HAS to be harder to master than a trigger that's not setup that way. My point is, why live with that when there are options.
But I betcha 95% of the "keep it stock" bozos can't shoot worth crap, and probably have never tested themselves in competition or anything. They just go to the range and make holes at 7-10 yards and think because they get a good group at that distance, while shooting slow, that they're a good shooter. Ummmm, hardly.
I took a new shooting buddy to my indoor range (he was new to me, not shooting). We were shooting slow groups at 7 yards at a quarter sized target. He had a stock trigger and had a group that was 3" at least. I let him shoot my gun with Ghost Rocket kit installed? He IMMEDIATELY dropped his group to 1". His mouth dropped.
That's not to say that a trigger job will make you a better shooter with no practice. Especially when you start adding distance and speed. But it's a helluva lot easier, and why not.