Since I started cycling on the road, I have heard, get padding in your shorts not your seat. I have read that ultimately it's more comfortable. I have been a good student and always bought expensive, hard saddles. Last year I started riding longer rides 100-200 miles. When done I has a sore back side, but so does everyone. Well this year I tried a saddle with a small amount of padding and I'm less sore after distance. Why does everyone warn against this? Is it more against the big 3" padded seats that are the problem? I know I'm staying where I'm at but please explain the theory?