In a multi column layout, I might wish to alter the width of the web browser in the primary column somewhere between 30% to 68%, in 2% increments, by simply tapping [Win+L] to increase its width, or [Win+H] to decrease its width, without worrying about whether it is the focused window, and without worrying about having to focus or adjust any other window after the keystroke was made to prevent overlapping.

If you want a layout where a web browser takes up 60% of the width, and two terminals take up 20% of the width, it becomes not only possible but relatively easy.