Many things Apple related are very often about applying existing technologies to a novel place. Many forget that the touch screens at the time were resistive [1] that required pressing (small but nevertheless) at the screen and mostly usable with styluses. As long as I recall the novelty was to apply a capacitive touch screen [2] to navigation, it does not require physical force and that's where the fingers shined.
Sure. But one can argue that capacitive touchscreens were about to happen anyway (like ARM laptops..). And HTC with their touchflow were moving into sausage friendly UIs.
But I agree, Apple is absolutely good at taking all this tech at the right time and making a compelling product. Steve insisted on glass/capacitive and that is just the best choice. Also, the UI didn’t feel like a layer (that you could easily get out off) as with touchflow. I’m also an iPhone user atm. Switched from Android about 3 years ago. The whole experience feels like higher quality to me still now. Although I have friends that would argue against that.
[1] https://en.wikipedia.org/wiki/Resistive_touchscreen
[2] https://en.wikipedia.org/wiki/Touchscreen#Capacitive_touchsc...