FTFY.
To a certain extent I'm kidding.
But the 2020 Denon and Marantz receivers do actually have functioning HDMI 2.1. It might not be perfect, but it does work.
The 2021 Yamahas are still locked down.
If you don't need the functionality, cool. Nothing wrong with that. But you still have a year old machine that isn't operating as advertised. *shrugs
I've been hoping they fix it and move on. Cheering for that, dare I say. So far, Yamaha is pulling an Emotiva on that one.