Foldable phones may resurrect the flip phone, but sliders may be the next big thing in the shorter term. The Xiaomi Mi Mix 3 doesn't have a keypad, instead the slider reveals the dual selfie camera - a solution to the notch problem while pursuing the all-screen front. A pop-up camera requires a mechanism that takes up quite a bit of space. And in the case of the Find X, the top of the frame was cut off, which reduced rigidity. Plus, the slider allows for interaction with the phone - you can answer calls, for example, or launch the selfie camera. It makes a ton more sense than squeezing the...
Source: https://www.gsmarena.com/weekly_poll_does_xiaomi_mi_mix_3s_unique_design_make_it_hot_or_not-news-33929.php