Plugging in and out a secondary display - actually works. Fractional scaling per display - actually works. Bluetooth - actually works. Audio - actually works. Screen sharing - actually works. Closing the lid on your laptop and expecting it to wake from sleep again when you open it - actually works. Printers - actually works. Playing 4k youtube videos - ok, it still burns some more battery but otherwise works.
Basically, everything just works. As for the rest of the OS, the article gives a good picture of what it feels like going back to Windows. With Linux, the OS is just there for you, stable as a rock with no interruptions. It's a boring appliance, doing what it is supposed to, nothing else, letting you focus on your applications. Compared with Windows that you constantly have to pet around with updates, installers and keeping the spyware on a leach.