I draw from your comments perhaps the single best argument in the primes vs. zooms discussion. A zoom lens provides the necessary compositional flexibility for a dynamic situation, while prime lenses afford the best artistic flexibility for static situations.
For me it almost just boils down into indoors vs outdoors. Indoors you have a fairly tight boundary on distance and can probably move around arbitrarily within that space. Things also tend to stay still for the most part, or move slowly (and again, not very far). Outdoors, range can be much greater, the variability of range can be much greater, and you might not be able to move to wherever you want to frame the shot, whether the way is blocked by thick undergrowth or a road. Subjects also change from walking speed (at most) to running, cycling, driving, or flying. A zoom lens helps a lot, especially in getting more total well-framed shots of a moving subject.

