I have also seen the situation where some one will ask me advice. their response is "that's not what the guy at the hobby shop said". they then do what the guy at the hobby shop told them to do, and it ends in disaster.
come to find out, the "expert" at the hobby shop is a person who "specializes" in drones, planes, or cars -- or worse -- trains, and has zero knowledge in boats or subs. he does, however, work at a hobby shop, which automatically makes him an expert at anything r/c related, and oddly enough, all of his advice results in him saying something like "i have exactly what you need right here in stock".
magnify this "expertise" by 2x when the discussion is about brushless motors or spektrum vs futaba radios.