"I have never benefited from the pretentious discussion of one style vs. another"
Im not sure you're making the point you intended. You don't have to get into pretentious discussions to be able to tell the difference between a Sally Mann versus an Annie Leibowitz. Both shoot people images, but they have an entirely different feel to them. I'm not into high minded conversations either, but I can also learn a lot about developing my own style by looking at the elements of other people's styles, and trying to emulate those elements in my own "work".
I don't pretend to be an artist. I just capture what I see and what interests me. As I evolve as a person, grow older, see things differently in different context, my style has evolved as well. While in Colorado to do some images for an industrial client, in the middle of literally no where, I took a series of images of some old abandon buildings out on the planes. When I got them home, and processed them, I discovered I had a new style I really like. Style changes and morphs.
Instagram is a blessing and a curse. Just like 500px. You can see a lot of stuff there that is well executed. But most of them are renditions of a common "style" for that platform. I see very little that stands out. There is a commercial benefit for being able to reproduce a common and popular style with regularity. There is equally value in seeing things very differently than other people.
The question is, do you have a style (brand), or do you simply copy everyone else style or what is popular. Neither are wrong, the later in many ways being more commercially viable.