Maybe it looks thinner, but it isn't... It's what Crapple does with their laptops: they create that stupid "wow" effect at first that makes consumers buy it, but then don't really justify the price after the purchase. In their case, it works. They invest into design and then can show it off in retail stores. Most of their products are bought on impulse, and their goal is to create this impulse. But the point is, this impulse is only important when buying. And even if PF had this design, nobody would get that "wow" thing because it's only sold online.
Ok this may be too long, I will put it short: it's good for the first impression, but just unpractical otherwise. Just think about the ports xD