Have you shot a customized gun/trigger?
I own plenty of Glocks but they cannot compare to my 1# CZ TS trigger, or my multiple 3# 1911's with zero takeup. Heck even my Kimber Striker fired has a better trigger.
Now does Glock trigger cause an issue? No, not really as it's adaquate. Better than some of my guns. but a far cry from being equals to others.
As Ive said endless times now, Im not a trigger snob or worrier. Unless there is something obviously wrong with one, which does happen on rare occasion, I basically ignore them and just shoot the gun. If your focus is on the trigger and what its doing, then youre not focusing on the important things, the target and the sights. Lose focus on them, and the best trigger in the world isnt going to help you.
Ive shot quite a few tuned triggers, I still have two guns that had them when I got them, that I haven't replaced back to stock, and they were well done and arent stupid light, and are just a decent trigger like any of the others, you squeeze/press it, and it lets the round go. Ive bought a number of guns that the previous owners "improved" and Ive put the triggers on all of them back to stock, and a number of them were Glocks.
I dry fire a bunch of different guns everyday, and shoot a number of different guns every week. I think a lot of dry fire with things like "stock" DA revolvers or autos is a better way to address the trigger, than it is to custom tune it.
All that does is limits you to be able to shoot things like that and hence I think the source of most of the complaints and "need". Regular practice with different things helps build the necessary "shooting" muscle tone needed for you to shoot well, and part of that includes having the finger strength to work the triggers on different things. It also hones your presentations, hold, and speed, and you get to the point, all your focus and thought is on the target and sights (if youre even using them), and that's where you want to be. You shouldnt have to "think" about the act of shooting.
Personally, I prefer to be as well rounded as possible, and to be able to pick up anything I come across, and be able to shoot it reasonably well. You dont usually get that by "specializing".
A real test to show where the actual problem is here, if its thought there is one, next time youre out shooting with your buddies, is everyone puts their guns on a table with a number on them and you draw a number and have to shoot the next string with whatever gun you get. And there better not be any complaints or excuses.