Sure, so authenticity is a moving target defined by the current members of a culture. I don't think that is enough justification to ignore it entirely. Regardless of how murky the definition is, surely I can say that a margherita pizza is more authentic Italian than a Domino's pie. It's a spectrum, and I am arguing more for the idea of distinguishing between large differences on the scale rather than quibbling about minor ones. I can agree that example is taking things too far without much productive purpose.