Dark mode is brilliant. Its flash transition isn’t.
Many heavy smart-screen users love the dark mode, i.e. inverting a light-colored background with dark text into a dark background with light-colored text. Medium got this user insight right, deployed a dark mode on its Android app.
However, navigating between different screens, I found many of its transition effect incurring a flash that could UPXET users i.e. hurting their eyes with a sudden strong light: