https://bugs.winehq.org/show_bug.cgi?id=21232
--- Comment #50 from Aaron Franke arnfranke@yahoo.com --- https://www.youtube.com/watch?v=F4Zoiyfk9v4
An update to the Steam client, which will likely be coming soon, will use the Chromium engine for the library. This means that every single function of Steam will use web UIs and Steam will become useless in Wine. When this happens, every single Steam game will become unlaunchable in Wine via normal means.
Because of this, I think this needs to be elevated to Wine's #1 priority issue.