Haha, well it's not only X11, but it's one of the main reasons. Other reasons are that for my usage and work, it just "works", no hours of configuration in dotfiles. Also it's convenient as a cross platform developer, since I can just crosscompile to Linux and Windows(mingw) via Docker. However, without the Mac, you'll have to break some licenses with a hackintosh. I think the project is cool, but in work related situations I can't do that because of legal reasons.
This also reminds me about a cool project I've found, but not had time to test yet; https://github.com/shinh/maloader