Here's my theory, Minecraft when it updates it goes back in time it usually gets a few new things, the beta didn't really have anything that's because that was the present date because the things that we once knew are either extinct or destroyed and the few things you have left aren't very useful other than building, over the years they added more and more things that you once knew but can't remember If they really were…but if they aren't what once was at least a new world is becoming a new.