Yeah, windows phone 7 was iirc Microsoft's first foray into flat/monochrome design, and in some ways it was wonderful... WP7 had a hyper-consistent design langu

Yeah, windows phone 7 was iirc Microsoft's first foray into flat/monochrome design, and in some ways it was wonderful... WP7 had a hyper-consistent design language that made normally-confusing flat UIs a dream... But ditching color in icons in favour of simple silhouettes was not one of its better ideas, and MS is still trying to make that a thing sometimes like 8 years later.