It was not revolutionary in the sense of technology, it was revolutionary in the sense of getting the general public to understand and accept the idea of a smartphone.

EDIT: Not to say it’s still necessary. I mostly stick to the iPhone because I don’t want to repurchase all the apps I already purchased, some for a significant amount, if I have to replace my phone. If that becomes moot one day, like if iPhones get to the point that they’re unusable or somehow Apple goes under, I’ll switch.