What was amazing was the '07 jailbreak experience was like 1000% better than what I'd experienced with Palm or WinMobile.. tap, tap, app appeared on home screen with a "lickable" loading progress bar.
I seriously doubt that jailbreakers invented the smooth experience - they just likely unlocked the functionality that existed before Apple was ready to push it out (I'm guessing Steve wanted apps in the store at launch).
Yeah the UI assets had to be there in the first place. Compared to SBSettings, the jailbreak era control center, which looked like someone taped together the buttons, and it becomes apparent that Job's statement was just salesmanship.