Honestly, the only thing that I see of any value for HDMI 2.1 is the Dynamic HDR. The Atmos over ARC might be useful for some people, but there isn't any content that supports HDMI 2.1 (which is basically 8k video). My opinion is that it's so early in this evolution that you really want to wait.
That being said, there is no physical difference between HDMI 2.1, HDMI 2.0, HDMI 1.4 cables. The only real difference is that the older cables might be missing a connection for pin 14 (ethernet/ARC).
Even HDMI 2.0 / 2.1 certification really doesn't mean the cable is great. I have seen really old cables such as Wire World Starlight 5-2 which blow away new cables that are HDMI 2.0 certified. lol.
That being said, there is no physical difference between HDMI 2.1, HDMI 2.0, HDMI 1.4 cables. The only real difference is that the older cables might be missing a connection for pin 14 (ethernet/ARC).
Even HDMI 2.0 / 2.1 certification really doesn't mean the cable is great. I have seen really old cables such as Wire World Starlight 5-2 which blow away new cables that are HDMI 2.0 certified. lol.