My mom believed in potty training by the 2nd birthday, but her methods were harsh and, according to her, pretty common at that time (although she might have been rationalizing.) She said she's lock us in the bathroom for hours at a time if need be and spank us if we had an accident, and with me she finally put my underwear in the bathroom and had me change myself and clean up after myself when I had an accident, and then she's spank me and put me in my room.
Idunno.. I've been around a long time, and I have never met anybody who would do that, or agree with that. It was always encouraging, and "Oops... that's OK" if there was an accident. I can see making a child change their own clothes, that's not harsh, but most parents/adults expect accidents, and wouldn't spank. I think your experience was different than most people. Perhaps your mom was very uptight about accidents? Or had new carpet? (not that that's an excuse)