Tapping, as opposed to dragging, a number or item should scroll it to be the selected item. This would be particularly good for AM/PM, where because it seems like a double option, you think you have to tap the unselected one to select it. Gerv
Triage: This is UX polish
This would also help test automation as tap is lower cost (in both execution time and reliability) than the action chains for press, move, release.