I couldn't find the elusive way forward on a desktop running Manjaro Linux, it's probably going to be restricted to Consoles and Windows, possibly forever. I could be wrong but my expensive mistake made me want to share the experience.

BTW-Arch, Gnome desktop, Lutris, Battle.net, purchase, poof, in that order.
It's not that I'm missing something obvious as I'm able to get into other "Windows" FPS games that way; I've read it's a problem of philosophy.

Steam Deck adjacent and hopefully helpful...