There may not be any real need for a double set triggers, but they sure do look neat on some of the old rifles like the Winchester High Walls. I like the way the Close-Coupled double set triggers look on a lever action. As my Grandson would say: Cool!

My ex wife's aunt had a H.M. Pope barreled Winchester High Wall Schuetzen Rifle with double set triggers in .32-40, false muzzle and all.
It had belonged to her father who had ordered it new. A family heirloom that I couldn't talk her out of!
They kept it hanging over the fireplace! Had on idea of it's value. I guess one of her boys, who had no interest, ended up with it. That was 40 years ago. No telling where it is today.
It was a joy to shoot. At least I got to experience it!

Ole Cowboy