300 bucks seems a lot.
Nowadays with ~100 bucks you can an amd64 box and a CEC adapter, which allows to use the default remote of your tv. Then you can install on it whatever you want, customize it however you prefer and have all the privacy you decide. No lock-in. As much AI as you like, zero is a valid option.
Do you know of a CEC adapter which can do HDMI2.1 4K120Hz? What has held me back from this setup is only being able to find 4K60Hz CEC adapters.
How will you play HDR media then?