We have NFC on key fobs, and have had it for over a to a decade. Toyota, Kia, Honda and others have had keyless entry, keyless trunk, and keyless ignition for more than 10 years. Why would this feature be "new"? It seems almost "old tech" by almost any standard of measure. The car detects the key in your pocket when you are outside the car, or attempt to open the trunk.
Why would this be "impossible" to incorporate into a Smart Phone with a built-in NFC? Seems it would relatively easy to have the phone scan the VIN, Make, Model, Year and then pair it with your existing dongle.