I've had exactly zero issues with steam on NixOS. It might actually be the best distro to choose short of the officially supported ones as steam runs in chroot with exactly what it's expecting in terms of libraries etc. Not a beginner-friendly distro though, user base is pretty much made up of devops, functional programmers, programmers appreciating replicable environments and willing to tolerate nix, as well as the odd enthusiast tinkerer.