For me, in general, there's 2 school of thoughts.
Getting the shot or getting only good shots.
People belonging to the 1st school, like me
, will have a General Purpose lens with a few purpose oriented ones. Obviously, this tends to overlap. I have a 18-200 as the GPMG, but its not stopping me from getting a 70-200 whose purpose is of course for quality. GP lenses are great for getting the shot but not necessary the quality. It depends on your tolerance for the quality (color, sharpness, bokeh etc)
People in the 2nd school, almost have no focal overlaps. They tend to have more primes or have the tendency to move to that. I find that due to the focal restriction, people are forced to improve their composition (and stamina from running around, heh). Hence, they are more focused and excel in their favoured range.