But when it comes to dress, talk, food, gestures, etc, few make claims that theirs are *safer* than those used by their immediate neighbors. Certain differences will exist for historical reasons, but that hardly means they stem from a rational basis (or shouldn't evolve).
I keep offering you the chance to say "Ya know, you're right... let's shut up and just go diving!' but your unwillingness to go there strikes me as odd. You're very conflicted and mercurial, and continue to try to shift between two topics...
1.) Solo vs team
2.) Redundant vs non-redundant
Which puts you in the very defective logical position of turning the debate into "redundant vs team" which is an argument that only you are having. On top of that you start adding other nonsense about "redundant, without proper training" vs "redundant, with proper training" and by extension "solo +/- training, with or without redundancy..."
Let me clear this up for you:
You are in fact allowed to dive with a buddy on our boat. In fact, we think it's a great way to add to the baseline level of safety achieved when you observe our policy of requiring each diver to have a redundant air supply, which we are willing to assume you are properly trained to use... because we don't want to be "big brother" and ask you to prove that you are.
I'm gonna go have a Pepsi...