No, I don't mean a sober divemaster, although that is sometimes required. I frequently dive in South East Asia, there, a divemaster is generally an underwater guide and spends their time in-water with the divers they lead.
At the other end of the spectrum, I worked on large charter boats where we would carry 40 or so passengers during the peak summer months; a smaller vessel I more frequently worked on had a capacity of 20 passengers. In such a case, a boat based divemaster is the most efficient utilisation of the position dealing with large groups of divers under their care.
Utilising a critical mass of people in high income economies, it is just not cost efficient to employ so many dive guides so a central dive organiser ensuring divers under your care are logged in, helped in and out of the water and logged back in again. Should they be required to enter the water, they can as well as providing search & rescue if required or emergency first aid. If the dive controller is undertaking a dive and such activities are required, then waiting for that person to return could be critical to getting the job done effectively - a dry divemaster is critical to achieving that goal.
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