The important wording in post #3 is without proper supervision. With a proper briefing, including "let me know when your at half a tank" and "you need ~900psi at the bottom of the line to do a slow ascent and 3 min safety stop", taking divers with <10 dives to the main deck of the Sea Tiger is common, without the need for "stage regulators". I would think that going to the sand beyond the bow at night with those same divers would only happen after verifying their ability on previous dives.
During the three winters I took inexperienced divers on Oahu's deep wrecks I do not remember any other boats using "safety stop regs". The Captain would just say "be back with at least 500psi or you don't get to do the second dive". If the Captain dropped us on a site with smokin' current he might not be as worried about tanks at 300 to 400psi but it is the certified diver and their guides responsibility to return with more than enough air to do a proper safety stop. There were also occassions where divers acknowleged being hoovers, a good question to ask at time of reservation, particularly for divers over 220lb. Taking a 100cf tank for the hoover is sometimes part of proper supervision.
There are places for "safety stop regs", like off Key Largo, with 50ft cattle boats, no guides and three very deep wrecks (Bibb, Duane, and Spiegel Grove). As far as I know Oahu's charter boat diving is all guided. I have had groups of mixed ability on Oahu's deep dives; part of the briefing was about how I may be ascending early with the newbie so the experienced divers will have to be good buddies and monitor their air so we can all do the second dive. Experienced divers should be able to end a dive with 500psi. Maybe Mike has the regs because he doesn't trust all OC's guides.