[ChuckNorris89]

You don't get promoted or get to keep your job by leaving the UI untouched for years.

That would be a cool Dilbert style yearly performance review:

- So what did you do this year?

- Nothing. I just left everything the way it's been for the past 10 years.

- Fantastic! I see a promotion in your future

Same goes for MacOS, iOS and Android UX too. They keep making changes for the sake of changes which are downgrades most of the time because the UI teams need to justify their salaries.