This is a very welcome development. One of the reasons I still have a dual-boot setup with Windows is gaming. Many of the games I play with my friends have no Linux support. I could use WINE for most of them, as far as I know, but it's too much effort for me to maintain that, when I can just boot into Windows and have the native experience without additional bugs that the compatibility layer may introduce.

Being able to install it with one click in Steam is a game-changer, especially with all the additional work Valve is putting into that ecosystem. I can live with a few "emulation" bugs (I know, I know, WINE is not an emulator) if it means I never have to switch into another OS, when the setup is this simple.

One of the first supported games is "Doki Doki Literature Club" which I actually streamed from my Windows PC to my laptop (which is only running Solus Linux) when I finally wanted to play it a couple of months ago. Guess I should've waited a little longer.

Another use case I've just been made aware of is downloading the Morrowind game files for use with OpenMW[1], which has Linux support but needs the original game files to function. Until now I had to either do that in WINE or copy the files over from Windows.

[1]http://openmw.org/en/