I did some cursory searching, and I couldn't find this idea being discussed, so I thought it would be a good idea to bring it up here. Is there any reason why a valid explanation for baryon asymmetry isn't that we happen to live in a world branch where there was a significant asymmetry in the creation of matter and antimatter in the early universe? If i remember correctly, the asymmetry was on the order of a part per billion, which is pretty unlikely, but it's pretty certain that the universal wavefunction had some amplitude in those states, and one of those states corresponds to our history. There are many more worlds that came from branches nearer to the average, but some fraction of worlds must be as skewed as ours or more in either direction. All of these branches decohered from us billions of years ago. The 'unlikeliness' can even be addressed anthropically: while more symmetrical states may be vastly more probable, only in a place such as ours can matter have a significant existence, and thus only in asymmetric places can life develop.