means the marketing myopia of seeing conversion as a tidy top-to-bottom pipeline while ignoring the messy, looping, multi-tab reality of how people actually decide to buy.

from a pun on tunnel vision, coined by marketers mocking their own obsession with the classic awareness-interest-desire-action funnel diagram, which has been drawn on whiteboards since the 1898 aida model long before anyone had a website to abandon.