Absolutely! Take Bonaire, for example; you get in, sink to where you are a bit above the reef and start finning out, slowly getting deeper and always seeing the bottom. So you have more of a sense of how deep you are, I think, than you do on a wall--particularly if the viz is good. If there's still light and you can still see a fair bit around you, this could give you a false reading of how deep you are. (okay, maybe not you, but definitely me!)
So these kind of places don't have real walls? You have to have a lot of horizonal movement to move vertically deeper?
Also most places I've been to in the Caribbean (Bonaire, Roatan, Cayman) require a check-out dive; not so in Cozumel, of course. The idea that new divers are going to these depths without any sort of advanced training is crazy, IMHO. Yes, I understand that there are hundreds, thousands of people who do so and survive to tell the tale. What does that prove? How many people have gotten behind the wheel impaired by alcohol and gotten to their destination without incident? It's called luck. But some time, some where, somebody's luck is going to run out.
Well if thousands do it, maybe it isn't that advanced or dangerous? People get behind the wheel with a drink or two and it isn't illegal because it isn't that dangerous?