I’d love a Windows 7-style calendar date picker for iOS such that it takes the place of the soft-keyboard with a 1-tap button for each day, and zoom-out to select months and years (perhaps with pinch-to-zoom?) - that way there’s no O(n) scrolling.

Windows 10’s Time picker is the absolute worst - clearly designed for touch-based devices it’s horribly inappropriate for mouse+keyboard devices: scrolling with the mousewheel is much slower than it should be, and there isn’t even direct numeric entry from the keyboard, it’s maddening.