It’s not really “just outside of Detroit.” I’m just outside of Detroit (literally; the city line is across the street from my house), but Partridge Creek is about a 45 minute drive from here. That mall has been losing foot traffic and stores for years. Yes, it is by a community college, but there aren’t many other “destinations” in that area (it’s mostly bedroom communities and some industrial/commercial out there). I suspect most metro Detroiters go to Somerset (or the other close one at 12 Oaks) as there are things to do near those malls. I also suspect that Apple’s probably looked at where its customers live in the area and concluded a lot of us would be more central to the downtown location. Furthermore, the strip along Woodward is becoming a Magnificent Mile-esque area where retailers want to be seen at, so it doesn’t surprise me Apple would want to get in there early.
My main issue with the store being downtown? Parking costs are atrocious in the area. Apple’s either going to need to validate parking at one or two of the garages close to them (and some of the businesses do, so it’s not unheard of), or they’re going to need that location to be truly as central as they’re hoping for. For the record, I am more likely to just walk into an Apple Store in downtown than I am in the suburban locations (I live and work quite close to downtown). Someone who is somewhat close to one of the two suburban stores and the downtown one isn’t likely to go downtown if they have to deal with parking.
I’d love to see the store last a long time down there, but I’m unsure the logistics of a downtown window shopping area are going to be able to properly support it.