This is very interesting to me for two reasons:

1. I'd really like to run my development environment for things under Siri for its tiling window management but for better or worse I'm deeply embedded in the Apple ecosystem for everything else, this looks like it could be a really nice way of doing it (possibly once multi monitor support is in).

2. There are still a few applications which have supported Linux builds but no support for macOS (Iridium's Niagara Workbench application for configuration of building management systems springs to mind here). Since Apple ended support for Quartz this has been a bit of a pain to deal with.