Agree and disagree...: RJP
Agree wholeheartedly with the "need to be diving with someone, a particular person" part. I don't care if you're diving with 100 people, absent a specific agreement with one specific person that he's your buddy - you are diving ALONE.
I guess you have to ditch all the OW training - all the parts they say you have to be in visual contact with your BUDDY. 100% agree that you dive alone with 100 people - YOu move your fins, YOU breath your gas, BUT part of SCUBA as a safety entertainment of body and mind - to minimize risks - is to have a BUDDY. And yes - it is an issue of trust, and how you come around to trust someone to be there for when you MIGHT need them, and how much of your problem solving under water includes plan "B" - called "BUDDY" - wasn't it really plan "B"?
I know it sounds like semantics, and of course if a buddy sees you doing something unsafe (exceeding depth limits, ascending too fast, whatever) they should try to help you. But if you think someone ELSE is responsible for keeping you safe, you are basically on a "trust me" dive, and you are now in one of the LEAST safe situations in diving.
One of the key words - and don't care how many dives we will have - is "SAFE" - and statistics read how many pro-s v/s nubies have taken for granted they can do it alone and thay can do it better. And yes, it is sematics - here, at sea level; decsion making and acting down under 70' or 100' has shifted, as you are applying semantics of 3 ATM to 6ATM - and universal laws don't work this way. So here - a BUDDY is someone to keep an eye on you, not to move your fins, not to breath your gas, but someone to make 3 ATM semantics work at 6 ATM to keep you as close as possible to your right surface by-the-book decsion. And you need to have one - as much as you have and trust your octo.Because the same terms you apply to TRUST dive in your scenario apply to the lonely diver - he does do a "TRUST in me only dive" and yes - it is a scary one, safety left aside.
Dry dives!