I didn't see many drysuits in my career because the work is too hard on them. The vulcanized rubber suits like the Viking are used more on jobs that have contamination concerns like inspecting and light repair in drinking water tanks, nuclear containment facilities, sewage plants, and large chemical spills. Dive cycles are limited by decontamination procedures either before the dive to keep the water clean or after the dive to protect the diver, crew, and gear.
Pee valves would be problematic in many of these conditions because you need to prevent contaminating the water, contamination from entering the suit, or both.
By far, the majority of commercial diving is wet because the work is so hard on the suits. Nothing can keep hard working hands warm in really cold water except hot water heated suits. Tearing a finger tip off your glove is just another place for the 2.5 gallons (10 Liters) per minute of 110° F/43° C water to exit. Hot water suits are an amazing brute force and simple solution to a complex problem. Returning to the bell to get a new glove is not viewed favorably by clients paying more than $250,000/day for the DSV (Diving Support Vessel) you are working from.
