You can run the game on Linux just fine, Larian just won't help you if it breaks or bugs out. SteamOS is just a well-customised Arch fork, after all.
Announcing official Linux support would also require testing on Intel and Nvidia GPUs, as well as other types of AMD GPUs, which would probably take much more time and effort than testing for a device with effectively two hardware revisions you need to test for. I don't think they want the support burden, and I don't disagree with them having had to debug obscure Linux GPU issues myself.
Announcing official Linux support would also require testing on Intel and Nvidia GPUs, as well as other types of AMD GPUs, which would probably take much more time and effort than testing for a device with effectively two hardware revisions you need to test for. I don't think they want the support burden, and I don't disagree with them having had to debug obscure Linux GPU issues myself.