[Porsche-O-Phile]

Exactly - if it's done properly Al wiring is fine. The problem is most installers don't really understand the difference and what's required so they "do what they've always done" and that's where the problems arise. This is a big problem in construction in general - you get lots of 30-year guys in the field (usually with big egos) who love to mock anything that's "not how we do it in the real world". You really have to take time to educate these guys and then make sure they're actually doing it the "new", correct way for that product / assembly. Most superintendents, CMs, QA / QC guys and architects / engineers don't have the time (or fee) to be chasing that out so it sometimes goes in wrong as the work crews "do what they've always done" whether it's appropriate or not. Your mileage may vary and some contractors are better than others in this regard but there's a LOT of "we know what we're doing - shut up and let us get it done (so we can slam this up, collect our check and be onto the next job)" out there. It does create problems (like this one).