My guess would be the fact that hardly ANYBODY competes under 200 anymore in the pro ranks.
Why not go by height classes? Are the pros that against having a SOLE winner at a show? I suppose it didnt' go over well for the women, so I guess so.
Even though the physiques lately fit 3 types (not meso endo or ecto).....mass monster, aesthetic, and short....Ronnie, Ray and Priest respectively....I guess you can't have 3 types of competition.