Why are classic 4 door sedans "disliked"?

My first Mopar race car was a 65 Valiant model 200 4 dr sdn, with a 170 slant six. I use to tow it to the track with a 65 Valiant 4 door station wagon. At the present time I have two 64 Valiant 4 door sedans. One model 100 with a 170 slant 3 speed stick, and one model 200 with a 225 and 904.