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My guess is they did market research and concluded that this interface was somehow the one their target demographic preferred.

If I had an app to write and learned that customers were most likely to buy it with a UI that involved waving the phone and grunting at it, I'd just shrug and build it that way.

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Here is how almost every government form in the UK works - long interactive form, mutiple pages of input. Then you get an error message at the end (or, sometimes you submit the form don't get an error message and then receive an error message in the post after 7/14 days). its easy to see how an interactive form that checks for consistency as it goes would win out!

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