I have always believed in a through cleaning and maybe some polishing of parts to make smooth contact, but never have stoned off material. I just like to shoot a lot to let things smooth and settle in on their own.
This ^^^^^^^^^^^^^^^^^^^^
I have never stoned a trigger. Most all of the triggers on my guns that were "a little rough" out of the box, all improved after 500 or so rounds downrange. I've also accepted the fact high dollar guns don't always come with triggers that break like glass rods. In fact the best trigger of any gun I own is on my $250.00 Marlin X-7 in .223. The trigger is unbelievable on that gun. It's a copy of the Savage Accutrigger.
In contrast, one of the worst triggers that "got better", is on my Browning Hi-Power. It was horrible out of the box. The gun now has around 350-450 rounds through it, along with a few cleanings and lube jobs. The trigger on it has improved
A LOT, just by shooting it. Some patience, and little ATF in the right places, along with a few boxes of shells, can sometimes really improve a crappy trigger.