Wall Street Journal:

Ive told an audience at the San Francisco Museum of Modern Art Thursday night that designing the smartwatch posed more challenges than the iPhone because of societal expectations around a wristwatch. The wrist, he said, is an ideal place for “lightweight interactions” and “casual glancing,” but not for heavy reading.

“Even though Apple Watch does so many things, there are cultural, historical implications and expectations,” Ive said. “That’s why it’s been such a difficult and humbling program.”

It’s obvious Apple has thought long and hard about that last sentence and maybe that’s why the Apple Watch will be more successful (although, that’s damning with faint praise) than other company’s offerings.