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I'm quite fine with a boat providing just a taxi ride and perhaps a site briefing, nothing more. That's how we do it over here. What I don't understand is why there apparently aren't common and established routines to ensure that everyone jumping into the water is counted properly.
For my type of diving, there's always a dive leader topside. Every buddy team, or - if solo diving is accepted - diver give their max depth and max run time. Plus tank size and pressure. This is put into a standardized form. The dive leader notes down the time the diver/buddy team goes under and writes the estimated time for surfacing. When the diver/team surfaces and boards, the exit time and preferably also exit pressure is put into the form. The "problem" for the diver is that they have to stick to their max run time, because if they go (significantly) over that, they risk that the dive leader calls in rescue services due to a missing diver¹. The good thing is that we have a written record and don't have to rely on oral roll calls, with their inherent risk for missing that a diver never surfaced, like what apparently happened in this case.
¹ Which is why we naturally give our MAXIMUM run times and usually surface a little before that...
For my type of diving, there's always a dive leader topside. Every buddy team, or - if solo diving is accepted - diver give their max depth and max run time. Plus tank size and pressure. This is put into a standardized form. The dive leader notes down the time the diver/buddy team goes under and writes the estimated time for surfacing. When the diver/team surfaces and boards, the exit time and preferably also exit pressure is put into the form. The "problem" for the diver is that they have to stick to their max run time, because if they go (significantly) over that, they risk that the dive leader calls in rescue services due to a missing diver¹. The good thing is that we have a written record and don't have to rely on oral roll calls, with their inherent risk for missing that a diver never surfaced, like what apparently happened in this case.
¹ Which is why we naturally give our MAXIMUM run times and usually surface a little before that...