You can create your product lists from the comfort of your bed/couch.
At first I wasn't sure if I needed this, but realized just now how BIG of a difference that would be for a my workflow. Right now, I spend about 5-10 minutes after each crafting project to write down all my supplies into a notebook. Later, I have to go to my Mac to find these products online and create my collection.
With a new, and more efficient interface plus a responsive design or even a mobile app (yes, one can dream :) ) I could skip having to write down all the supplies and could instead create the collection right away. That would be an incredible time saver.