Personally, I like authentic Mexican food. I can't stand what I call "yuppie Mexican food". No squash in my Chile Rellenos thank you.
I also like authentic Mexican food, very much so. But this won't stop me from
also enjoying innovative riffs on the theme. Nosiree. Those are often good too.
Also, it's worth mentioning that authentic mexican tacos can be vastly more diverse than we Americans might imagine if we haven't traveled extensively throughout Mexico.
I live in a city which was once within Mexico -- Santa Fe, New Mexico. And, contrary to the uninformed opinions of some, our unique local / regional cuisine is nothing more or less than a regional Mexican cuisine. I am also a card carrying and certified chili addict, aficionado, zealot and devotee. Most Mexican food involves or includes chili, of course, but nowhere on Earth is chili so central and revered as it is in my little town.
Perhaps the variation on the Mexican food theme you call "yuppie Mexican food" should be called something which has less of a economic class connotation? After all, I enjoy some of this culinary innovation myself, but can't afford (at least not often) to dine in "yuppie" spots, and don't really much care for "yuppies". I don't want my culinary proclivities to be associated with yuppies.
I also listen to jazz, blues, rock and roll, pop, folk ... African, Indian and a thousand other kinds of music. I think music genres and food genres are similar in various respects with regard to the question of "authenticity". What folks often mean by "authentic" is really "traditional". There are good and bad riffs on both musical and culinary tradition. I like the good ones. AND I love the traditional ones, too.