Digital vs Analog Creative Brief - Different Key Questions

This is a slide shown at an APG conference in Germany. It features different approaches to planning of Digital and Analog disciplines. Basically, there is nothing new, but a lot of symptomatic stuff to say about it. But first of all, let me translate briefly into English. This scheme juxtaposes Key Questions to be answered: 

Analog: What is the consumer's motive (to buy/use)?, What is the message of the brand/ad? Why should she believe us? How do we stay recognizable? How do we gain attention?  

vs.  

Digital: What is the user's behavior (in the digital space)? What is our offer/experience? Why should she take part? How do we make space for sharing & for new stuff to be created? What do we offer to make them spread our story?

While this really is a helpful introduction into basic differences between digital planning (experience planning) & analog planning (brand planning), there's a gap that always strikes me. And I mean not the one between digital & analog but the one between digital & purchase. The digital planner - at least according to the scheme above - does not explicitly ask herself how the digital experience connects to purchase or usage motivation for the PRODUCT to be sold. It starts off with the question about user behavior in the digital media space rather than in the product usage space. Of course, some digital experiences are directly related to purchase or usage like it is the case of e-retailers, airlines, etc., but clients like e.g. detergents, burgers, canned soups, etc. are not used or even bought online. So how would this kind of planning actually plan for purchase?

The major challenge for digital planning is to show how this non-message- & non-motive-approach is connected to purchase. Classical brand planning or account planning connects to purchase via a model of consumer motivation which the communication tries to evoke or to alter. What is the purchase influence model used by digital planners? I'm sure there is one - but has not been formulated clearly, yet. Up to now it seems that the mere fact of brand exposure & experience as such is supposed to drive propensity to buy. This well may be the case but on the other hand it would mean that it makes almost no difference what exactly the experience elicits in the minds of the users as long as the familiarity with the brand increases. In other words: "As long as people are engaged in any kind of experience - it sells". Is this true? Has this been researched properly? This is a big opportunity for academic studies to come.