The reason the bumper was available at launch was because Steve Jobs already new they were shipping with a sub standard, compromised antenna. That was well documented in the Wall Street Journal.
When advised of the problem months before launch, Steve flew into a rage and told the engineers to stuff it.
When the public outcry came, Steve got offended & outraged. Holding a press conference he spoke condescendingly to his loyal customers, acting like we are idiots he told us off. Saying "You're Holding It Wrong".
What a swell guy
Yet I will admit after I attended Apples class on how to hold my cell phone, the problem stayed the same, but I felt better