You have a very confused (and easily countered) set of misconceptions. Let's just deal with one: were it not for a bunch of old fart, free diving skilled, snorkel wearing, swim testing, NAUI instructors, specifically: Lloyd Austin, Jim Stewart, Paul Heinmiller, Glen Egstrom, Robert Given, Mark Flahan, Mike Lang a few others and myself, you'd still be using tables ... because computers would never have obtained the needed breakthrough acceptance that we provided back when there were only four types in existence.
The reason computers replaced tables was because SDI stopped using tables. PADI had members asking for it to be stopped a long time but until SDI stopped using tables, no one else took the plunge. (Just like how I had to become an IANTD instructor to teach Nitrox, PADI just lets others take the legal leap and if it is safe follows.)
Unless you are willing to call the head of SDI a NAUI person (I mean he is (and he is also a PADI person, etc.) but then again, so am I a NAUI person), and claim his credit.
In many places, swim tests-gone. In many places, dive tables- gone. In much of the real world of diving in the open ocean, snorkels-gone. For real safety reasons.
The only reason to use snorkels is inertia. Eventually we will recognize them as the foundation of a separate exciting worthwhile activity. Until we do, we will turn out divers who will only get themselves into trouble trying to use snorkels in the real ocean, and we will never have real free-diving training.
I love free diving, and I love snorkeling. I wish they woould get the heck oout of diving and be recongized as the worthwhile syand-alone activities they are. I would love to take a good free-diving course.
Every student say the same thing about reg/snorkel exchange: Why? Espcially when I give them much better ways to be on the surface with the heavy tanks
underneath them, (not on top of them rolling them over all the time). Every single one of them wonders why they would ever use a snorkel instead of the much better options avaiable to them in non-emergent situations, and none of them trust them in rough conditions because they fail to protect the airway unless a really irregular breathing pattern is used, and even then they choke the person using them randomly (random because the person cannot see the waves coming.)
For those who say a snorkel makes a surface swim easier, what????
Pleas come take my open water course where I will show you three different ways to move on the surface that are far, far more efficient than snorkel use with scuba on. And safer too.