My personal experience is that by cropping in the camera has caused me to focus much more on, composition/framing/lighting/the-whole-enchilada, than I had previously mustered before.
Again, for me, the lesson of getting it right in the camera was further enforced by denying the use of an image which wasn't 'correct in the camera'.
I also believe in only shooting with one lens which quickens the time required to harmonize with that lens. (No, I wouldn't employ the one lens training technique for work.)
Sure, these techniques, lessons, training may not be for everyone, but I am willing to bet dollars to doughnuts that nearly every successful photojournalist incorporated these techniques on their road to making better photographs.
I hate bringing up that I was a pro ... I am not trying to elevate myself above others just for the sake of elevation. But, I think it is important for those reading this thread to understand where I am coming from. Maybe what works at a pro level of competency is too extreme for a hobbyist level of competency. I don't know ... But apparently, by many of the responses it does not. Maybe it is my natural competitiveness clouding my vision ... But I just assumed that most people who are so into photography that they contribute routinely on an Internet photographic forum, would want to shoot like a pro, would actually want to make their photographs better. To that end I offered my suggestions and personal experience. I acknowledge that I am not the best photographer on this forum. There are photogs shooting infra-red, ultra-violet, landscape, et al ... Which are far far above my pay level ... But, in the genre of photojournalism and for the consistency require to be a pro, I think I'm pretty good and that others may learn from my personal experiences.
Maybe, the lessons which my mentors taught me, of how to make better photographs, are too extreme for those not desiring to be pros ... I don't know ... I started shooting as a stringer for the local papers when I was in junior high (middle school). I do believe that getting it right in the camera, with the severe penalty for not getting it right, will make you a better photographer. The concentration of purpose required to consistently get it right in the camera will elevate your images to higher level of success. (A byproduct of getting it right in the camera is harmonizing with your equipment, the two go hand-in-hand when shooting photojournalist type of subjects.) The severe penalty I and my mentors imposed on my photography shortened my learning period.
Back in the film-only days when I was shooting professionally, we would expose for our personal film development chemicals, techniques and previsualized final print. (i.e. I only agitated a couple of times during development.) Similarily, I believe one should intentionally expose to an expectation of post processing manipulation. Getting it right in the camera may mean to underexpose for the final image, if that is the shortest/cleanest road to take. Et cetera.
More often than not, I shoot with the intent to document and report ... Not to make art. As such, I typically restrict myself to the tools I would use in a wet darkroom, dodge, burn, contrast, dust removal, et al. This also helps reinforce the lesson of getting it right in the camera.
Finally and again, I believe that getting it right in the camera will help people become a better photographer and will significantly contribute to making better pictures.