What was so revolutionary about the original iPhone? I don't think anyone could point at any single feature throughout the whole smartphone revolution and claim it was "revolutionary." It was always a combination of features and design decisions that made the phones so easy and pleasant to use. There were many phones before the iPhone that were way more capable, yet nobody talked about them.

Siri, TouchID, FaceID, capacitive touch screen, great cameras, app store, full fledged browser, LTE, etc...

Any of these features by themselves aren't "revolutionary" until you combine it all into a cohesive experience where you look at your phone to unlock it, take a photo that until very recently could only be produced by a DSLR, upload it nearly instantly to a social network within 5 taps, and then receive real time notifications when other people comment on it, all on a device you can hold in one hand.

Sure, you could say this is more evolutionary than revolutionary, but again, I don't believe there was this time where it was revolutionary to the extent you claim. It's always been a slow iterative process.