No, but a lot of people think they can forego the former by simply spending the money for the latter, and will be a better shooter because of it.
Well, that is not an inaccurate assumption.
A given shooter will probably shoot a given gun better once it has had improvements to the trigger.
I have never made any changes to any of my handgun triggers, beyond cleaning and lubing. My CZ I shoot DA-SA in competitions. My Redhawk is DA in competitions.
The point is, I don't think I rely on a better trigger to shoot. If others do, that's their problem.
I don't see why I should keep my EDC trigger in a state that is not as easy to shoot.
Particularly as the likelihood of my needing to shoot it in a high stress situation far out strips the likelihood of my having to shoot a completely alien-to-me gun in a high stress situation.
If that is not the case in the US; if people are are swapping guns left, right and centre, then I think it's a relevant point. But not in my case. I have two comp guns. I only shoot them in comps. I have one EDC. I only carry that. I shoot all three when I can.
And, once more, I don't see that one (better trigger) excludes the other (practice).