Another thing to consider is that there is no one "theory" on what constitutes "proper weighting." There are definitely more than one "proper weighting theories."
Here is a theory;
If we say that the last 500 psi, that the modern dumbed down scuba instruction says we are to surface with, is for our buddy when they are out of air, what if we are 40 feet down, with 700 psi, after a strenuous dive in current and surge, where your particularly buoyant buddy ends up out of air, excitedly needing to suck on your alternate in order to do a controlled ascent, and both of you are "perfectly weighted" for norman breathing at 15 feet with combined 1000 psi, how controlled will that combined 500 psi excited alternate ascent be?
I think at the very least "neutral at the surface with an empty tank" is a weighting theory that should be considered, if we are really going to be properly prepared for the emergencies we say we are preparing for.
Here is a theory;
If we say that the last 500 psi, that the modern dumbed down scuba instruction says we are to surface with, is for our buddy when they are out of air, what if we are 40 feet down, with 700 psi, after a strenuous dive in current and surge, where your particularly buoyant buddy ends up out of air, excitedly needing to suck on your alternate in order to do a controlled ascent, and both of you are "perfectly weighted" for norman breathing at 15 feet with combined 1000 psi, how controlled will that combined 500 psi excited alternate ascent be?
I think at the very least "neutral at the surface with an empty tank" is a weighting theory that should be considered, if we are really going to be properly prepared for the emergencies we say we are preparing for.