Curiously since I have returned to fix length prime lenses, I have noticed how many more of my images have not needed to be cropped. What once was recently a rare moment, it has been occuring much more often.
Now that's a paradox. The main reason for using zoom lenses, was the perfect cropping convenience, and yet nearly all of these images were cropped a bit or a lot. It seems in order to get the better lens quality, I would always leave a bit more of the edge insuring better resolution. The sharpest part of any lens is towards the center, with a diminishing standard as you go further out. I know this, and it has obviously influenced how I frame and shoot.
Another factor in long range zoom lenses besides being slower in light transmission (smaller apertures) is the design is often a compromise to get the best results over the longer zoom range. When I shot with my D800, I would mount the convenient 24mm-120mm, or later switching to the 28mm-200mm lens. Both were a variable aperture from F3.5 to F5.6. But the convenience of the one lens carry was huge, even if the camera lens combination was also huge.
Since returning to the manual Leica M 240 using only fixed single length lenses, the apertures have gotten much light faster going to F2.0 to F2.8. Since I have to move in and out to frame the camera by walking, I have become more critical of the frame edges, giving me more no cropping images, which also maximizes the sensor size a bit more. As each lens was designed from start to finish at it's exact focal length, the compromises zoom designs have built in are eliminated.
Of course the camera bag is heavier, as the camera/lens size has gotten smaller. Now to replace the single zoom lens, I carry a 28mm, 35mm, 50mm, 90mm, 135mm and a 200mm lens. As I found there is no perfect solution, but a side bonus is the need for less cropping.