Eh, that’s pretty darned far from an i3 or Xmonad experience. It’s roughly as wrong as saying that the Gnome frameworks are just as good as Cocoa :-)

I have used i3, awesomewm and Xmonad extensively for years so rest assured I wasn't implying anything like that ;)

I was more like pointing out that macOS does allow for the following in some way out of the box:

> Every OS should let you line up two windows side-by-side out of the box

Sorry, that really was only an example. I also didn’t say, or mean to imply, full-screen only. Every os should also let you line up windows top-to-bottom out of the box. Etc. Macos' approach of allowing one very specific combination of window arrangement, then trying to make a feature of it by calling it 'fullscreen' or 'side-by-side' (or whatever they call it) just doesn’t really cut it.