It’s not that it’s impossible to make a useable flat UI, it’s that people constantly forgot critical functionality.

You need to denote a button is different from text. You need feedback that a UI element was interacted with, and for toggles you need for people to be able to tell what represents on vs off. The borders between different UI elements needs to be clearly defined, etc etc.

New people are born every day.

If you introduce flatness without also adjusting the colors (or worse, making many backgrounds translucent) you end up with really poor contrast.

This is a somewhat unpopular opinion here, however I do think flat UI can be done right and is well fitted to digital UIs.

It's possible to have a flat style but have buttons that look clearly like buttons, and elements that have shadows and colors.

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