What's the point of knowing someone else's speed, if we have a distance/direction and an estimated time overhead/joining the circuit?
"VFR Jizzler ABC is one two miles west, inbound at two thousand fife hundred, circuit area two one."
As soon as I hear that, I picture where the aircraft is and compare my estimate at the same position.
These simple concepts seemed to be just that, when I was taught to fly. Why complicate it?
Spot on, roundsounds: Let's spend our flying lives staring at screens....