I have a benchrest rifle with a 2 oz Jewell. It's more like a mental command than a physical motion. It takes getting used to, and most shooters who aren't used to it will trigger it accidentally on their first try.
A step up from there is my F Class rifle - it has a two stage trigger at about 8 to 10 oz. This feels very comfortable, and about as light as I can go without feeling like the trigger is twitchy.
Moving up the chain, is my "precision" AR with a Geissele two stage set at about 2 1/2 pounds total. At this weight, I'm aware of weight of the trigger and my hand strength just starts to play a role. For a field rifle, this is as light as I'd want to go.
The heaviest trigger in my safe is in my High Power AR Service rifle at about 5 pounds - another Geissele two stage. It's at 5 pounds because the rules dictate a 4.5 or heavier trigger. It is a disadvantage compared to the lighter version in my other AR. There's no way to sugar coat that.
Will proper fundamentals cure the problems of a heavy trigger? Sure, but it's hard. All the forces in your hand have to be lined up just right, or you'll move the rifle. 5 pounds is a lot of force in this context. Of course, there are guys who can shoot high master scores with a service rifle. I wish I was one of them.
Can you jack up the trigger pull on a light trigger? Yes, but it's hard. When the firing pin falls at 2 or 8 oz, you just aren't exerting enough force on a heavy rifle to do much. You really have to manhandle it to screw it up.
One benefit to a light trigger is that it's easier to practice the pull because it's pure motion - you don't have to overcome any resistance. I think it's easier to develop a consistent pull on a light trigger without adding the complicating factor of the additional weight. But to each his own. There is more than one way to skin a cat.