One of the things I still love about my 11" MacBook Air is the ease of using multiple desktops (spaces). Even with the tiny screen, I can quickly switch between apps and keep things organised with the trackpad gestures. Drag and drop is also more seamless in macOS compared to Windows.
Of course I also want the 15" air so maybe I just like cool stuff. But I think there's a place for a real ultraportable that's not trying to kludge any of the awful keyboard cases on an iPad.