Perhaps this is best discussed in the commercial diving area. I have already stated that in my opinion, a diver's equipment has nothing to do with the diver's ability to dive safely from a narcosis perspective. The diver can either function in a safe manner and perform his job properly, or he can't. The workplace health and safety regulations governing the safety of the diver are clear. If there is a safety hazard, the dive must be terminated.
Yet, OSHA states additional safety measures that must be taken into account for diving below 100' on air. Specifically:
Subpart Title: Commercial Diving Operations
Standard Number: 1910.425
Title: Surface-supplied air diving.
1910.425(c)(4)
For dives deeper than 100 fsw or outside the no-decompression limits:
1910.425(c)(4)(i)
A separate dive team member shall tend each diver in the water;
1910.425(c)(4)(ii)
A standby diver shall be available while a diver is in the water;
The fact that you want to take the discussion on requirements for commercial diving to the commercial forum reinforces the fact to me that comparing your dives as a commercial diver and these dives as recreational divers are apples and oranges.