Which product design innovation is credited with revolutionizing its industry by introducing a touchscreen interface that eliminated physical keyboards, despite significant initial skepticism from industry experts?

Product design isn't just about aesthetics—it's about solving problems in revolutionary ways. Throughout history, certain product designs have fundamentally changed how we interact with technology, sometimes creating entirely new categories or disrupting established ones. This trivia question focuses on a pivotal moment when innovative product design transformed an entire market and consumer behavior along with it.

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The original iPhone (2007)
The first Amazon Kindle (2007)
The original Microsoft Surface table (2007)
The first iPad (2010)