i know its not googles fault. I was mearly piont out the end possible result with many versions for devolopers to account for. Problems like this can't but not happen.
facts only for the people who hate apple which wouldn't be facts at all and only slanted opinions. I have seen no speed difference in many 3gs models going from IOS 4 to 5 to the latest 6. Also, I have seen no speed difference in iphones 4's, 4s's, 5's going from version 5 up to IOS 7... when he stated "cripple" that means something is not operating as intended. If a 3 gs (or even a 4) doesn't have Siri, then it isn't exactly "crippled" if Siri is left out of the update when going to a newer OS since it didn't have it to begin with. A minus is only a minus if something is taken away.
I find you saying that you saw no speed difference going to iOS7 with a 4 a bit disingenuous.
It might not be a documented fact, but it is plastered all over the Internet about how iOS7 slows an iPhone4 way down. I have personally seen it myself.