While I do agree with this, if you take it to the extreme you might as well leave traffic out of the screen altogether. Traffic helps sometimes on cross-country trips when talking to ATC, but it helps more so when not talking to anyone, and helps even the most in the traffic pattern. Sometimes people will call their downwind on a certain runway, but be on downwind for a different runway. The traffic display helps you know where to look. Other people are either instructing or just being dopey and flying the pattern without talking. This helps you know that they are there. Yeah, midairs don't happen when the planes are a mile or two apart, but knowing there is a plane a mile or two away can help you see them earlier, know where to look for them and avoid getting close enough to become a problem. Even two miles or less away, in the traffic pattern, it can be hard to see a plane even if they are calling their position. Seeing them on the display makes it much easier because you know exactly where to look.