I used to shoot a prime lens exclusively 30+ years ago. The lack of being able to crop within the lens just became a source of frustration for me. I still will use my trusty 50mm lens from 1985 for special shoots, or when I need good low-light performance. But if I had to choose only one, then a zoom has to win it. It would be neat, however, to do a photo challenge (even here at AK!) where we all take photos using our prime lenses only. Maybe a bi-weekly photo challenge series of threads? There could be a lot of themes. I can think of a half dozen right off the bat.