I can't say for certain one way or the other, but especially when you look at certain areas of the country, like the SMR, very few are ornate in any way. Hawken styles are usually plain. NW trade guns had the side plate, but not much else, I think it was some "bling" to keep the customer, which was often our Indian friends, happy, much like beads, shinny objects etc. ? Fowlers seem to be fairly plain, but certainly their are more ornate examples. I think the "thumb, wrist plate on a Bess or musket was for Martial unit markings etc? I have Lancaster, Dickert and Haines style Longrifles and they are only moderately carved and engraved as opposed to some that look like works or art? SO, I don't really know what was the most prevalent. I just think that many people, especially those on the frontier, were there for a reason and that was usually cheap or free land, hence they were not well off, and that they would probably not be willing to pay for ornate carving etc. However, maybe some Gunsmiths started to throw in some carving or engraving to help set their rifle apart from others and help sell them? I really do not know, just food for thought! I also believe there was a lot of pride in workmanship back then. People were often apprentices for Years, and a wood worker, metal worker etc may take decades to be a "master" in a Guild etc. That's is what is great about this whole line of thought, we will never know for certain and can therefore entertain all sorts of possibilities! IMHO