I am not in the "shoot it until it smooths out camp." I'm talking about EDC guns, not range guns.
To me, it is a frustrating waste of time and ammunition. You don't know if it will improve, how much it will improve or when it will improve. Meanwhile you are sending $0.40/rnd ammo down range knowing in your heart and head you want a better trigger. For 500 rounds that would be over $200 in just ammo. Polishing fire control parts if you can do it yourself costs a few dollars and a couple of hours. It will give you very good results the next round fired.
I also am not in the camp of, "If you alter it you will face a prison sentence." Any modification that improves reliability, accuracy, or ease of handling without stupidly compromising safety can be justified by an intelligent person and attorney, IF it is ever even brought up in court.
Don't remove or deactivate safeties. Don't modify to lightweight (<4#) or target or single action triggers.
I can shoot stock triggers, often better than the owner of the gun. But I can't shoot them as accurately, fast or consistently as my improved triggers.
I also improve the grip on my guns. Smooth the actions, including the slide stop/release. I have installed different barrels, added better sights, and even added backplates with my family crest. I use extended mags. I use expanding bullets. A compensator to reduce muzzle rise for faster, accurate follow up shots.
Individually such mods are probably no big deal. However, the stacking benefits of a bunch of such mods do improve my shooting ability—with plenty of training and practice.
You can win a gunfight with a stock gun and trigger. You can win a gunfight without a lot of practice or gun fighting training. You can even win a gunfight using FMJ ammo.
You can also lose one because you were a quarter second slower or much more inaccurate than your adversary. Not every good guy wins a gunfight because he is a good guy. The bad guys usually start the action and cheat. You have to catch up and overcome. Small improvements to your equipment can mean a big difference.
But I choose not to carry stock guns. There is no mass manufactured gun that cannot be made at least a little better, easily and inexpensively. I enjoy polishing certain components for better, smoother actions. I don't mind paying for an improved and still legally safe Apex trigger. I want every advantage I can get.
It bothers the snot out of me to shoot a stock gun that I can easily improve. However, really, I have no problem if someone wants to keep a gun stock, perhaps just "broken in", but hopefully for the right reasons, which is not the fear mongering of long prison sentences for doing so.