Interesting, about boxing in the picture. I guess I could say my approach has been to "unbox" my subject by leaving some room--some environment--around it. That might be part of why I like wide angle lenses.
I like wides, too, the wider the better, but I had an interesting period in my formative years when I was a news photographer. Back then photos were printed to fit the layout, so that the cameraman making the plates didn't have to waste time moving his setup back and forth. I quickly learned that if I gave my editor a four-column photo and he could make it into a tight three with scissors, he would, in a aesthetically-merciless way. In self defense, it got to be a very intentional game for me to get everything I needed into a box that couldn't be cut without ruining the shot, and it was great perceptual training. I might have given him a half-column of air, but never a full one, or the scissors came out.
I can still make a long shot, or an environmental photo if needed, but you still may not be able to chop a column off the edges. It's not evil to cut the subject, either. As I developed this, I started to enjoy Degas more--he did the same thing. This is the period where I started printing with black borders. Not as a conceit, but because I needed every fraction of a mm that the film would give, I was cropping so tightly in the camera. I'm not always as rabid about it as I used to be, now that the man with the scissors is gone, and often put more air in a photo, but never without being completely aware of what I'm doing.
This was probably a 21mm shot, with bare-bulb flash on a stand (folk dancers rehearsing before a TV show at the fire station next door--in a tiny town you can do that), shot in 1978. There's plenty of context here, just not way out past the central subjects:

Dancing at the Fire Station
by
Michael Darnton, on Flickr
Something from a couple of months ago, 50mm. Choppy chop chop, but nothing essential cut off, and enough background to know what kind of place it is (collapsible Summicron, wide open; my favorite lens then, still my favorite lens):

Patrik with cello
by
Michael Darnton, on Flickr