Did you know that nearly everything is different in the HDMI 2.1 on up format? Not even the transmission technology is the same! Here is the best part, its a lot better! eARC, ALLM and QMS are already implemented in sources/displays. In short, if you are not supporting this format, you are not getting all of the signal available. With the help of HDMI's website, here is some info on all of the new features.