I use Youtube on deck in Firefox with youtube.com/tv in kiosk mode. Works really well, but I noticed even when I have a bigger screen connected I can only watch videos in up to 720p. It doesn’t let me select anything higher. Is that a YTTV thing or is there a problem in my setup?
OP is talking about YouTube and I can watch 8KUHD just fine on Linux.
Youtube TV though acts in the same way, I don’t believe they allow anything > 720
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youtube.com/tv is/was the YouTube website optimized for big screens. It’s basically just a different layout for regular YouTube.