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YouTube got an 8K upgrade on the Meta Quest
It's doesn't make much sense now, but it should soon.
Google is likely laying the groundwork for the YouTube VR app to run at 8K on higher-resolution Android XR headsets, which will come later this year. As long as you're on YouTube VR app version 1.54 or higher, any non-HDR video that's been uploaded in 8K should give you the option to play it at full resolution when in immersive mode. The Samsung XR headset is said to be launching later this year and would utilize extremely high-resolution OLED displays that could potentially take advantage of the newfound resolution boost in YouTube VR.
Or read this on Android Central