An "Innovation" Explained

Innovation is the application of new SOLUTIONS that meet new requirements, INARTICULATE needs, or existing market needs.

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via www.dropbox.com

via www.dropbox.com

There is an inarticulate need to remove Samsung Logo, the Back Button and Menu Button which are always there whether you need them or not. Buttons and logo which are always in Portrait Mode even you put your phone horizontally.
Sometimes Back and Menu buttons are hidden in Samsung phones. But you can still accidentally tap on them.
This design innovation from iPhone met a new solution to remove unnecessary ornaments and functions to make at least viewing movies distraction-less.
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A62-thickbox_default_medium

via www.dropbox.com

via www.dropbox.com

Galaxy Nexus is a bold redesign of Pure Android experience. You won't see a single button in front!
Take a closer look, they enlarged their screen but incorporated in software those physical buttons. Hardware-wise, no button at all. Software-wise, buttons occupy space and most of the time are STILL there whether you need them or not. I reiterate "most of the time" since some apps go full screen sometimes.
Do you think it is a solution for a buttonless smartphone?
Thus, I still think that iPhone's Home Button is an innovation. A well-thought redesign of smartphone to meet an inarticulate need to remove unecessary steps, functions and ornaments in iPhone.