While I love and been daily driving Linux for years now, the fact you can't stream beyond 720p in most streaming services (because of DRM certificate issues) makes it a no-go to the most basic users.

It works for me cause I only use YouTube and Twitch, which work properly, but I need to pirate movies and TV shows.

Most specifically about SteamOS, it literally says in the page "Users should not consider SteamOS as a replacement for their desktop operating system".