use cases related to delivery of product

To follow up on the use cases discussion from today's meeting:
https://www.w3.org/Payments/IG/wiki/Main_Page/FTF_June2015/UseCases

There are some use cases listed where I understand what the use case
means, but it's not clear to me what its relationship to a web
payment technology is supposed to be.  For example, on the wiki:
> Virtual Goods (Delivery of Product)
> Physical Goods (Delivery of Product) [At Risk] 
linking to
http://www.w3.org/TR/2015/WD-web-payments-use-cases-20150416/#delivery-of-product

Is listing these is as use cases intended to say that the Web
payment technology should actually know something about the delivery
of goods, or just that it ought to be usable for purchases of
physical and virtual goods even if it doesn't actually know anything
about delivery?  (If the former, it's not clear to me why it's
important for either to be part of v1; if the latter, I'm not sure
why physical goods should be at risk.)

-David

-- 
𝄞   L. David Baron                         http://dbaron.org/   𝄂
𝄢   Mozilla                          https://www.mozilla.org/   𝄂
             Before I built a wall I'd ask to know
             What I was walling in or walling out,
             And to whom I was like to give offense.
               - Robert Frost, Mending Wall (1914)