I was so disappointed that Valve chose Arch as their base for SteamOS. SteamOS is excellent, and all the work they do has gone back upstream to make Arch and Linux gaming better, but I feel like it was a missed opportunity. I've always thought that NixOS (and immutable distros like Fedora Silberblue etc) are perfect for embedded or consumer appliances. I feel like a bit of help from a company that actually uses NixOS in a mass market product would really push it over the edge in terms of usability.