"Making all 3 calls can jam up the radio. Especially when it’s busy. I believe the original CASA change was brought about by one or more incidents where less calls would have reduced the risk of collision."
No offence Mike - the above is bovine excrement. Look at the calls that I make - by doing these, any non transmitting aircraft will hear me and know my location & intention. My calls enhance safety. There is a world of difference between making a small number of courtesy/just in case there is someone out there, calls and blocking the airwaves with unnecessary verbiage.
"Another thing that particular instructor brought up yesterday was aircraft naming and it really doesn’t need to be in every call..... "
Personally, I hear/register the type of aircraft far more readily than the registration - Rylstone Traffic Cessna KZS joining X wind for Runway XXX - Cessna is what makes an impression on me - if needed, I can call back immediately Cessna Rylstone..... and make the connection . Of course if here are multiple Cessnas in/entering the circuit, I have to step up to the mark and use the rego (KZS) to differentiate.
Being able to identify the more common aircraft aids in location eg calling you will be number two to an RV, places you in the circuit que for all other circuit aircraft.
"......It’s for situational awareness of performance. We know a 172, warrior etc will be around 100kn downwind. We hope an RV has slowed to a reasonable circuit speed from their 160-180kn descending approach. We will notice a warbird calling because it’s likely to be fast and wide. We got that on their first call."
Since when is a pilot supposed to have an understanding of other aircrafts performance characteristics? How does this assist safety? It's the flying pilots job, to fly the circuit suitable to his/her aircraft.