@godzero @goldstein I looked everywhere for a dumb tv last time around and it didn't make financial sense. In the end I did the same as you by the sounds of things, just bought a smart tv, but basically locked it to a streaming dongle and use none of the inbuilt features.
@Saintcam @goldstein
I plugged the TV into the AVR and did NOT connect it to the network. Sources are a Roku box, MacBook, Android phone, PS5 (incl Blu Ray) and a NAS.