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"I wonder -- is there a third way? A dreamscape where farmer's markets and artificially intelligent shopping carts coexist in loopy harmony? Perhaps the cart might offer some advice on what to do with the turnips?"
There is--it's called Organic Express (there are similar services available, but that's the one I subscribe to in LA). You can just let them assemble you a box of whatever local organic produce they have that week, or you can log on, look at the list of this week's produce, figure out what you might make with it, and order what you need. They even include a weekly recipe with your delivery.
However, the real issue with these "smart" shopping carts is---puh-leese, you want me to TYPE a shopping list into the computer before I go to the market? I'm lucky if I show up with a cryptically scribbled scrap of paper listing the ingredients I seem to recall might belong in a recipe I'm vaguely thinking of making if I have the time.