I don't think that's the job of Valve.
They tried to push Linux gaming a decade ago by providing a Linux distribution optimized for gaming and invited hardware vendors to sell machines with that distri.
At that time a gaming optimized distribution was hardly needed, so they were pioneers at the time.
And they still maintain their SteamOS, although it is only supported on Steam Decks.
But there has so many happened since then. Gaming Hardware is working from Day 1 with Linux. Proton - wich is supported by Valve - is supporting latest games on Linux, mostly from Day 1. At least if the developers don't actively sabotage it.
As a result we don't have that one SteamOS distribution which would ultimately put us in dependece from Valve. We have several different gaming optimized distributions that you can use.
It's great that Valve does so much for Linux gaming, but I don't want them to manage everything.
Yay!
I am playing this toghether with my kids.
I won't miss the creeper