Sorry, I should have done this from the get go for context. I keep referring to my “previous issue” without linking to it.
Yes, fully capable. I’ve got the 2019 Shield pro, Hisense 55u78G Smart TV and a Samsung hw-q950a soundbar all of which support Dolby Vision, Atmos and TrueHD.
I get what you are saying here, but firmware updates for my devices require user interaction to complete, and the only one that has had an update lately was the Shield with experience 9 where playback was still working. HDMI 2.1 cable is brand new and the stock one is in use with the soundbar which is brand new.