Everyone has their own opinion about this question; do (4) nails help better than (6) nails per shingle? My sales guys ask me if it really helps, during our sale training meetings, what do you guys think?

I have been told by new roofers, "That any goof, can Roof" and everytime I hear that I cringe..And get angry....Do you you roofers feel the same way? We all know what it takes "Roof it Right, and It's Water Tight"