It might've been, but I agree with the core point: make window tiling an option. For the amount of time that it would take to implement, and the non-zero number of people that would benefit from it, it seems a glaring omission. Every OS should let you line up two windows side-by-side out of the box: this should be a minimum requirement of any window manager that lets you have windows at all.
Full screen mode is macOS native tiling mode, you can put two windows side by side and use as much real estate as possible (no menu bar nor title bars)
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.