Tim Gray
Well-known
I prefer shadow detail to pushing. I prefer a tripod to pushing, I prefer faster film to pushing. Pushing does not work because it does not put more shadow detail on the film, only exposure does that.
All pushing does is raise contrast on the meager image that does exist.
I agree with everything Ron is saying. Pushing doesn't create real speed. From what I understand, at best, it gives you 1/3-1/2 a stop depending on the conditions.
At the same time, if you have no choice but to underexpose a film, say TMZ at 3200, or detail in the shadows isn't important to you, overdeveloping plays an important role if you are going to print in the darkroom. With scanning, you can just underexpose the film, develop normally, and bring the contrast up to normal in photoshop. If you print in the darkroom, you could do the same, but at some point, you run out of grades to go to in an effort to increase contrast to put it where it should be. So, you overdevelop (push) the film in processing, allowing you to print your photo at around grade 2 or 3.
At least that's my understanding of it all.