I think of tiling WM in terms of never having to leave my keyboard, or in other words, never having to make use of the mouse/touchpads. That itself leads to a vast boost in productivity. I haven't used macOS in a while, but when I did use divvy(?) To tile, it seemed cluncky.

Something like i3 is complemented with heavy use of the terminal, which has its own productivity boost over GUI applications. Throw in vim shortcuts in Firefox and you essentially have a system that is completely usable without leaving the keyboard.