It's sad that he's reporting Apple's late arrival to the NFC club as a "ground breaking" feature. Many people have been paying at registers for years with a swipe of their phone. I'm sure Apple will, again, retroactively claim credit for revolutionizing something everyone else had been using for a long time. I digress.
The author touches on a few key points that BitSharesX addresses. Namely his reference to the wallet picking the best asset to pay for an item. If there was ever a use for Pegged assets this is it. With the peg you'll always know exactly what the various assets are worth.
I don't see it as an app searches the wallet but the wallet references a feed or series of feeds to establish pegs to a common denominator and makes that knowledge "public" to other apps on the phone.