No pineapple, sir. That drink is already sweet enough with rum, curacao, and the orgeat. In fact, I usually up the ante on the lime and if I'm feeling drunk and putting my purism aside, I'll toss in a few dashes of ango bitters to truly balance it out.
That sort of thing is acceptable in tiki, but adding a whole new juice (especially one with as intense and polarizing flavors as pineapple) really takes away the identity of the beverage. Mai Tai's have a pretty unique flavor.
But generally, yes, I'm a traditionalist when it comes to the classics. I think the worst thing that happened to Old Fashioned-s and Martinis was the 80's. That's when people started chucking in those godawful red cherries and whole orange slices in the former and then the Kangaroo Cocktail (which originated from the vodka influx of the 50's) all the sudden became the standard Martini and took all the flavor out of the drink.
Sorry, my friend and I were drinking whiskey and talking about these sorts of things earlier.