So, all those pros who shot 2 1/4" square format film Hasselblads, never cropped?
I do try to frame things perfectly in the viewfinder, often to my chagrin. I have to constantly remind myself "what if I want an 8x10?" Sometimes a nicely framed 2x3 perspective image will crop nicely to a 4x5 perspective. Sometimes, I have to back out a bit to allow for cropping.
Sports is another are that I often crop. I always shoot single-point focus and try to bump the focus point around the viewfinder to accommodate my desired framing. But, there are times when the action is too quick and I resort to the center focus point and crop later.
Real photographers use the tools available to them to get the image that they seek. Cropping is just another tool.