Im going to agree with him here. Most of my GA flight experience is around lake environments and float planes attract pilots who tend to be much less observant because they view them as toys. This often creates a hazardous environment around them. Ive had two near collisions with float planes where they were in my blind spot and I was out their left window. We missed by only a few dozen feet each time, which is probably because they didnt bother using the right pressure on the altimeter. When I was a student there were routine cases of the local float planes flying near maneuvering aircraft at such close distances they would have to be blind to have missed them.