Traffic Info.
Brilliant Stuff,
The aircraft type is included with traffic information because ATC doesn’t know the experience of each pilot. Although you may not recognise all aircraft, many pilots do, so ATC uses issues inclusive information so you can use what can. If you have trouble finding/following/avoiding the traffic, advise the controller who can then be more specific. Including the type can also increase your situation awareness. Even though it may be white or a dot, the type also gives you an indication of speed and whether the wings are on top (Cessna) or under (Piper), for when the dots take on some form. Helicopters are easy; the wing (rotor) is always on top so often traffic is passed as “a helicopter” rather than a type.
This is similar to pilot phraseology when arriving at an uncontrolled airfield, you include your type with the inbound call although you don’t know who else is in the air.