AdivingBel
Diver
IMHO, the impact of current instruction on someone staying in the sport is relative to the locale and type of diving. I could see it having a much larger impact in cold or low viz environments. In "tidy bowl" diving, if the individual is reasonably confident in the water prior to instruction (weeding out the "nervous nelly's" who may be water challenged) and they have a competent instructor teaching the current guidelines, I wouldn't think a lack of confidence in their instruction would really be a "most common" reason to give up the sport (as long as subsequent dives post instruction were in a similar environment to which they were taught). That seems like a lot of caveats, but my guess would be that encompasses a large percentage of diving & divers in general. All IMHO, via "tidy bowl" diver (N=1). 

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