It does seem odd that the reception issue was found out within the 1st 48 hours of the phones release yet no one found out about it in the months of testing for the phone...
Nearly two million testers vs. a handful of testers.
We reached this conclusion after testing all three of our iPhone 4s (purchased at three separate retailers in the New York area) in the controlled environment of CU's radio frequency (RF) isolation chamber. In this room, which is impervious to outside radio signals, our test engineers connected the phones to our base-station emulator, a device that simulates carrier cell towers (see video: IPhone 4 Design Defect Confirmed). We also tested several other AT&T phones the same way, including the iPhone 3G S and the Palm Pre. None of those phones had the signal-loss problems of the iPhone 4.
That article is very snide and negative... The bumpers actually do protect the phone as they have a lip and protect the sides of the device. They protect the front more than most hard cases. Furthermore, they look really good on the white iPhone...
I really highly doubt the bumpers are part of some nefarious plot. Apple isn't like that, they care about the consumer, whether you want to believe that or not.
Also, less people used a case because the iPhone 4 has a real sleek look. Maybe every smartphone has the same, if not worse, problems.