For formal NRA type target shooting, single action is the only thing that counts, and I "think" there are match specifications as to how light a trigger pull you can have.
Many older revolver target shooters converted their gun to single action-only, entirely doing away with the double action feature.
For CCW and "combat" you have the same spec.
In the old days, people judged a revolver on how LIGHT the double action pull was.
The lighter the pull the "better" it was, (or was supposed to be).
Today, with super-fast DA revolver shooters like Jerry Miculek, we've learned that SMOOTH is what's important, not "light".
A smoother trigger action FEELS lighter, but really pays off in accuracy and speed.
The lighter an action is, the slower the hammer will drop. This actually slows you down, and reduces accuracy.
For that reason, most of us prefer to offer action jobs that retain the factory mainspring, and possible a slightly lighter strength trigger return spring.
Al this sounds counterintuitive, since everyone KNOWS a lighter trigger is "better".
Keeping the factory weight mainspring keeps hammer speed up, and pretty well eliminates mis-fires.
Some shooters even keep the stock trigger return spring.
So, SMOOTH is better than Light, and actual trigger pull is not really a factor.
Many people don't want to hear all this, since what they believe is "lighter is better", and what they want to do is install a spring kit, not have a pro do an actual action job.