We didn't shoot IDPA that much over the years, but a fair bit. I don't ever recall really being on the loosing end when it came to using an AR.
I never owned one that didn't have a 2 stage trigger in it.
Now I won't argue that top of the line shooters should use what works best for their sport and I realize that action shooting might be better served with a single stage.
Though I've shot a few matches at even longer distances where it was fire as fast as you can, hits count, misses don't.... and I don't recall being at a loss there and generally at the head of the pack as I really loved those matches....