My regular QF DOM 738 flights always have some non-WP somehow use the CIS to get 4B/E to have the "Extra Legroom", "No Recliners in front" or "Get off the plane quicker".
Yet often 5B/E thru 8B/E are empty, with WP's on the aisles and windows.
I use 5A now for that reason, very good chance of...