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I view it as a piece of safety equipment and wear it for all ocean dives. IMHO, a worse case senario is a catastrophic air loss with sudden current. I have never had the air loss but dove French Reef (KL) once where the current went from 0 to 60 in a matter of minutes. It is either on my mask or in a tank bungee.
In some of the places where I go beach diving, snorkels are required by law. And I have seen life guards had out tickets for no snorkel. So yeah, I wear a snorkel.