Instead of just giving your destination (Limit Price) for doing your activity (buy, sell, short, cover) if you give your actual position (actual price) you are saying this is where you are and that is where you want to go. If you also add the daily change then you are saying this where you are , you traveled this much today at this speed in this particular direction (right or wrong depending on what your scenario is) and that is where you want to go.
In my opinion more information is always nice and in this case is a matter of just adding links to values that you already have since they are the same for everyone and all dependant of the same value (ticker symbol probably). In short is just a display.
thanks