The OP is referring to Apple's iPhone power/usb connector cable, as seen in this picture:
http://i.imgur.com/yAywo.jpg. The dock connector strain relief is decidedly weaker (I have had two or three break on me personally) than other Apple products.
One thing that is interesting is how Apple's Industrial Design team, mentioned in the post, affected the design of the new Macbook power adaptors (like the one you linked to, http://www.cl.ly/0r2n2S2z1b3K0L1E0R3t). The old ones had the cord coming out perpendicular to the laptop. I liked that design a lot better than the new style, which is a bit awkward to plug in and leaves you either:
1. With a cord facing out the back of the laptop, then (probably) looping around 180 degrees and back to the power outlet, or
2. With the cord running parallel next to the laptop, completely blocking the ethernet port.
Obviously neither of these solutions is streamlined or Apple-like, so I wonder if the ID dept made the trade-off of a parallel connector with minimal strain relief, or a perpendicular connector with built-in strain relief.