A:Answer It' good engineering design and it's a good thing to also have eARC on at least one of your HDMI 2.1 ports! For example, let's say you have a receiver that supports HDMI 2.1 AND Dolby Atmos that you use to connect all your devices to. You would want to connect the receiver to your eARC HDMI port on your TV for that Dolby Atmos, but you would also want that port to be HDMI 2.1 so you don't lose the 4K @120Hz! For reference, Samsung decided to just do 1 HDMI 2.1 and 1 separate eARC HDMI on their 2020 QLEDs. Having that single HDMI 2.1 port separated from the eARC capable port created a whole bunch of issues and limitations such as no uncompressed audio passthrough, not being able to use high end audio systems, not being able to play surround sound on some game consoles, etc.
