According to this video (6:34), Zotac Zone Pro should have eGPU support confirmed by Manjaro lead Philip Müller https://www.youtube.com/watch?v=1kfkRPXOLU4
According to this video (6:34), Zotac Zone Pro should have eGPU support confirmed by Manjaro lead Philip Müller https://www.youtube.com/watch?v=1kfkRPXOLU4
If I had to guess because SteamOS is based on Arch and Manjaro being easy to use and based on it as well saves R&D.