Bare knuckle boxing has its roots deep in the history of the world. In modern times, it is mostly popular in the UK in the gypsy community. Regardless, bare knuckle boxing is nothing more but brawling with just fists, which you can assume currently happens frequently and has happened worldwide throughout history.
Boxing is a refined sport with a worldwide following. It has big money involved, and as a result, has talent from all over the world trying to compete in it. With money on the line, you will have people extremely motivated to become the very best with the top training methods, diet, and technical training. The talent pool increases significantly, and this is why a top boxer will always be more much skilled than a top bare knuckle boxer.