Can't see that that is much of a thing. https://www.trustedreviews.com/opinion/h-265-vs-vp9-4k-video-codes-explained-2920862. Seems HEVC (of which VP9 is a derivative) seems to be widely supportedI know Apple hates Google these days, but I would really hope they add VP9 support in hardware or even software at this point. YouTube has got to be one of their most popular apps, missing out on 4K content with the Apple TV is annoying. If I want to watch something in 4K, my TV has Chromecast built in and supports it, so I have to go that route.
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or the worse picture qualityThe sad thing is VP9 is royalty free so there's really no reason for it to not be supported. It's simply Apple being stubborn like they tend to be at times about these things.