Also, there’s a law of diminishing returns on focal length. Generally in the real world anything over 200mm is going to produce atmospheric effects, haze and mirage distortions that defeat whatever inherent crispness might be in the shot. Creative photographers find ways to get closer to the subject.

Pro photographers are mostly seen using those huge 400 / 600 / 800 mm artillery pieces because Nikon and Cannon pay them to be seen with them.