When I first take the photo, I try to get as close to "full frame" as I can. Then later when I print, I will crop as needed. I do this for 35mm and 120 film. When shooting large format, I will be contract printing, so I just try my best to go "full frame" all the way through. It has nothing to do with any philosophy for or against cropping. For example, if I really missed the mark with the 8x10, I have no problem cutting the print down to 5x7 (cropping by chopping?). I'm not a purist, I'm a pragmatist. Whatever works within the confines of the medium and tools.