Tell me why I need HDMI 2.1

[nugent]

OK, here's my situation. Just bought a new Sony 77" OLED.

I currently have a 12 year old beast of an Onkyo 7 x 140 wats per channel.

Obviously it isn't 4K compatible.

For "now" I would prefer to stay under $500 fo a stopgap receiver.
Don't want to rush into spending $1,500 or so on a receiver right now.

To the HDMI question I am looking at these two Denon models,
https://www.accessories4less.com/mak...-w/heos/1.html
https://www.accessories4less.com/mak...-w/heos/1.html

I do not now, nor will I in the future ever be doing any sort of "gaming".
There will never be a game console involved.

The Denon 1600 model does not have 2.1 while the 960 does.

With all this said is there any scenario where I would need HDMI 2.1 for "my" purposes?

My speaker set up is all super-efficient Klipsch so the power of either should be at least adequate for now.