Is there some specific feature that SteamOS brings to the table that people are looking for? So far as I know, a stripped down installation Debian or Ubuntu (Valve likes to base their packages off of Ubuntu) with an Xserver script that directly launches steam in big picture mode ought to create roundabout the same experience I would think.
It is in fact, a US vs Europe thing. Stateside “SMS” is ubiquitous. I put quotes because it’s not really SMS anymore. It’s either RCS between Android users or iMessage between iPhone users. The only time SMS actually gets used is between Androids and iPhones, because as other commenters in this thread mention. Apple refuses to implement RCS on their devices in a way that is compatible with non-Apple devices.