If you make a list of groundbreaking products that would include the light bulb, the bicycle, the refrigerator, the radio, the car, printed books, the newspaper, the TV, personal computers, mobile phones... The iPhone is great, but I doubt it could even make it to the top ten.

But the comparison is that it is "[arguably the most groundbreaking product ever] sticked to your eyes", and the property of groundbreakingness is not necessarily transitive.

You mean more than the invention of fire or the printing press ?