I believe instruction only explains so much. You've got two kinds of divers...those who dive every weekend and those who dive only on vacation. The latter group often suffers from a lack of fundamental skills which stems from their only moderate interest in both the sport and becoming better and safer divers.
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I would define the two groups differently. It's not the frequency of diving but the attitude toward diving. Those that dive as an occasional hobby and those that dive as an obsession. For some of us obsessed with diving, we may only have the opportunity to dive on vacation. For these unfortunate souls...there is SB on the SI.