trailhorserider, as I said earlier, I know NOTHING of Western. But in English, the snaffle is the predominate bit as we ride on a contact. No riding in plain curbs here until you get to a double bridle, which incorporates a curb with a snaffle - however most contact is taken on the snaffle even while using a double bridle, with the occasional touch of a curb.
Muppet, again the English vs Western comes up - a snaffle might be a colt starting bit if your aim is Western riding with no contact. I can see why a curb is then used, but in English, particularly my discpline of Dressage, we ride on a contact with aims of collection - different type of collection to the Western 'collection'. The contact will gradually lesson, as most aids come from the seat, and the contact is simply there to contain the front end of the horse when generating a huge amount of energy in the hind end.
I have never advised a Western rider to go back to a snaffle - purely because I don't know how that training system works. So I chose to keep my nose out of subjects I do not fully understand.
In English threads however, 9 time outs of 10 I will recommend to stick with the snaffle, and get some lessons. As JDI said earlier, a rider good enough to use a harsher bit, is not going to come onto a forum to ask 'permission' to use it because their horse's training has progressed to that point.
Most of the threads here are asking about horse problems, that really have nothing to do with the bit, but the OP is asking if a bit change would be appropriate. Then of course, they are going to get a 'stick with a snaffle' response.