This in combination with the 3D acceleration work going into QEMU [1] could end up being a pretty compelling solution for running the x86 Linux version of Steam on macOS.
[1] https://gist.github.com/akihikodaki/87df4149e7ca87f18dc56807...
[1] https://gist.github.com/akihikodaki/87df4149e7ca87f18dc56807...
https://steamcommunity.com/discussions/forum/0/2976275080122...