The reason for the difference? Many. Primary reason given? Recreational Divers aren’t trained to handle that many items of buoyancy control. When you task load a Recreational Diver with remembering where they have air to vent you run a higher risk of injury.
Then why would you change the way they were taught in their ow classes, they didn’t have a dry suit then.
and yes i reread both naui and padi drysuit course guide lines and standards, and it actually doesn’t say how buoyancy is controled while wearing a drysuit, i tried to attach these pages for you but was unable to.
section 9 under specialty diver courses in PADI manual, NAUI was borrowed.
so if you as an instructor could tell me where to find this info it would be apperciated, not that i’m going to change the way i dive, but i would know where to find this information and address it with all the instructors that i have been taught by.