I agree that I am correct

but I disagree that the bottleneck is the iPhone. The real bottleneck for most iPhone WiFi speed is the speed of the underlying Internet feed. The iPhone can theoretically pick up speeds up to 50Mb. or so, the speed of the g protocol. But few underlying feeds exceed 10Mb/s, the theoritical speed of the slower b protocol.
This is all really just so much talk because most of us are happy when our iPhone Internet moves along briskly, which for me happens with anything above 3Mb/s or so.