Okay...I'm going to reveal just how inexperienced I am right now, but...what does SOP stand for? I keep seeing references to "SOP" breed standards, but I don't know how to find info on such standards.
SOP is the Standard of Perfection. It's the guideline for breeding the traits that make a chicken look like a particular breed. There is way more to a breed than just feather colors, but a lot of folks don't realize it. You can get it here:
http://www.amerpoultryassn.com/store.htmm There are places to get old versions for free or cheap, but they do not have the most current information and may not have the extra info that is provided regarding general breeding of poultry.
I don't think that breeding to the SOP and breeding for production are mutually exclusive. But I think that there are more people who breed for looks rather than for production simply because people are so removed from their food that they can't think about production - especially meat production. And on this particular site, the pet chicken keepers far outweigh both show people and homesteading types that use chickens as livestock.
There are "old" breeders who get on here once in a while, but most do not. But when you practically get crucified for discussing the only medicine being used for your flock is an ax...who wants to deal with the outrage constantly from the folks who shove antibiotics down their chickens' throats every time they hear one sneeze? Heck, some people wind up with their posts deleted because someone complained and the moderators removed the "offensive" posts because many folks don't want to hear about butchering their "roo".
Then too - I don't find that there is really a lot of things that can be said about breeding for production without just rehashing the same information repeatedly, in short cycles. Discussing non-production breeding has more facets to it and I think that it is easier to keep the conversation flowing on those lines because there are so many more differences when it comes to breeding for physical appearance. How many times can you go over examining your birds for keel depth, pelvic width, size, vigor, trapnesting, getting rid of pinched tails, etc. before you end up with the conversation being exhausted? I think that also plays a part into why you don't see as much conversation on the threads regarding production.
A number of "old" breeders that I have interacted with consider looking at production as part of breeding to the SOP. You just don't find them online all the time. And if you want to get info from them, then you have to ask questions because the few that do get online don't know what information people are looking for if people don't ask.
I've seen plenty of people breeding "show birds" that don't have a clue about or care about production. But there are people that breed for both. And it's a challenge, I think it's more challenging than just breeding one way or another. And for me, with a dual purpose bird, that makes it even more of a challenge to balance production and breed to the SOP so that my Javas don't wind up looking like Plymouth Rocks down the road but also still produce decent meat and eggs.
I wouldn't go by the threads on this site as being all inclusive of the folks out there that do breed for production though. Because it isn't. This is a good site to start with as you're learning, but there are other places to interact with more serious production and SOP breeders. I get more personal messages and private emails on these types of subjects just because lots of people don't want to post publicly and wind up getting hate email.