Email, social media and eCommerce. Smartphone, tablet, laptop and addressable TV. Today, the average person will interact with up to seven screens on any given day.
For marketers and businesses trying to reach customers, that means seven opportunities for a message to get lost in translation, seven windows for the customer to see a redundant message and lose interest, and seven screens for the marketer to lose track of their customer.
https://www.equities.com/news/why-is-customer-journey-tracking-so-difficult/