[margana]

You can't play 4K Netflix on Linux, period. Because of DRM. Before you say "this is just a Netflix issue" - you can't play 4K Prime Video on Linux either. Nor 4K Disney+. And many other services. Piracy is the only way to watch most 4K streaming content on Linux. You may have the most capable and up-to-date hardware on the market, you still can't.

[tombert]

Yeah, that realization is what killed my attempt at replacing my Nvidia Shield TV with my home-built SteamOS box. I got everything "working" in the most technical sense, but I was limited to 720p on Hulu, and that ended up driving us crazy. I know that the box is capable of streaming 4K video just fine, because I was able to stream my 4K Blu-ray rips from my Jellyfin server just fine, so this limitation is purely artificial.

I did do some experimentation with VMs and emulation and whatnot, but I never got anything that worked consistently enough to use full-time, so I bit the bullet and plugged my Nvidia Shield TV back in.