Point of HDMI 2.1 TV
1. 4K resolution +120HZ screen refresh rate TV
2. 8K TV
The HDMI2.1 port is used to connect to external devices, such as players and game consoles. So, both ports and wires must support HDMI2.1.
Point of HDMI 2.1 Port
1. In the future it may be possible to play 4K@ 120FPS movies on external players. At present, there are few such films and they are only available in cinemas.
2. The console supports HDMI2.1, the graphics are 4K@120FPS, and the port supports variable refresh rate VRR and automatic low-latency ALLM. If you are a high-end console gamer, you will need this port for a better gaming experience.
To sum up,
4k@120fps or 8k@60fps high-end video players and high-end console game players, as well as 8K TV users, need this port, others actually basically do not use this port, do not blindly pursue, rational choice. Don't agonize over something you don't need.