I use both Linux and Mac, and in my experience Mac's handling of multi-monitor setups and, specially, of them changing, is only slightly better than Linux's.

For most situations you do not need to do anything difficult to plug any number of monitors to a Linux computer with a modern, full-featured distro, other than arranging them. Mac does a better job of remembering your setup and adapting to a monitor disappearing, but it's not that much better.

I'm still not sure I understand why the author needed this tool, may be because they have more than one computer plugged into the same monitor?