I argue that 'very commonly used' is subjective, and someone new won't know all the ones you or I consider common. One of my goals in writing software is to make my code understandable to complete newcomers. I can't always achieve it. Sometimes other design goals take priority. But from my perspective this one is a no-brainer. I just don't see the down side. If it's too time consuming to type, use them for typing practice and get faster :-)