Re ambiences: same here, as @Fellfrosch. I have separate ambiences for Day (all sounds enabled), Night (no notifications, calls go through), Meeting (no sounds). Having different color schemes makes it easy to check what's the current setting. Having a proper device with the hardware switch for ambiences (tri-state switch on OnePlus X) and Kimmoli's code to enable it, helps a lot. No need to have ambiences on the top menu then...