It's possible to be an autodidact, and certifications don’t guarantee competence. But,
@Boarderguy , dismissing decades of research on gas density, and narcosis doesn’t make you a diving savant. It makes you a reckless gambler with a PADI AOW card. You call open-circuit tech dives “forgiving.” That’s not confidence it’s cluelessness dressed as swagger. True autodidacts bridge knowledge gaps with humility, not hubris.
The purpose of training is to make sure you've at least been introduced to concepts. Training with instructors exposes gaps in self-taught knowledge, hones decision-making, and reduces the odds of a fatal mistake. Your dismissal of it as unnecessary for “forgiving” OC tech dives ignores how unforgiving 60m on air can be when things go south. It’s preparation, not babysitting.