While we think of push more in context of notifs - this same logic can be applied to any recommendations that come over a channel where intent is to be inferred based on past behaviour versus determined based on user input - be it on email, or any messaging channel or even on a subsequent visit to a page.

While we can debate the merits/demerits of push - for practical commerce, a large part of the world still switches on push, and relevant push will deliver more concrete and better ROI.