The turnstiles are unfortunate. They send the wrong psychological messages -- complexity, exclusion, a barrier to entry. I can't imagine that they stop any actual thieves, considering how brazen shoplifters are these days.

And they really aren't necessary. The Amazon app has location services permission; it knows when I'm in the store. That's apparently enough to track me along with my purchases, and to flag anyone who tries to enter the store without the app. So what's the point of the turnstiles, exactly?