I hope I am not coming across as spamming as this is my third post to this community today. I won't do another today but I just thought this was interesting. I watch most of CTT's videos and this was one from a live stream where he went into gaming on NixOS.
I've been using the Steam Flatpak on NixOS and it works great, the native one wasn't working but that might've been because I was doing weird things with Impermanence and symlinks and stuff