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>Everything has a reason - if you can't explain "WHY", you shouldn't be designing UI .

oh UI design in such an app always has a why

Before doing any modification on the UI of such an app, a lot of attention is given to user data.

It can't be completely objective because at the end of the day any interpretation of user data is at least a bit subjective (and generally way more than that). It does aim at being data driven though.

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How does one prevent data-driven design from becoming a self-fulfilling prophecy?

A/B testing with groups of random people put together in a room, using unreleased versions of the application.

You don't :/

Again at some point there is a part of subjectivity in how you analyze the dataset.

It is still better than having no idea what your users are doing with your product.

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