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.