1) A set of double 100s or a backmount CCR is half that weight so quit exaggerating what is being expected of supposedly fit and qualified divers.Your waffling, don’t change the subject, tell me the specific situation that would require a diver to physically lift 100 kg underwater, if there is none then there not required to lift it on land.
2) Having someone who can't move their own basic gear around is like having an injured or disabled diver on every charter. That person requires almost all of the crew's attention. So that means the remainder of the paying passengers get little or no attention. If one of those other divers is incapacitated or injured there aren't enough hands to manage the new injured person and the diver who boarded the boat unable to do anything on their own right from the get go.
3) If someone requires 100% of the crew's attention then they should pay for their own private charter and/or additional spaces for extra crew or in-water supervision. It's common in adaptive diving to hire or get volunteers as extra support staff but that's not what we're talking about here.
4) SB has officially lost its mind.