"ROCAS" shouldn't be required. I agree.
However there are the minority of pilots that spoil it for everyone else.
I recall a few years back an aircraft was freecalled across to us from an adjacent unit. ATCO was busy at the time and eventually invited the pilot to pass their message around 90 seconds after they first called. The pilot passed their routing, straight through the CTA VOR DCT VOR, didn't request CAS transit. When the assigned squawk was displayed, low and behold the aircraft is 3nms inside CAS without a clearance.
When this was pointed out to the pilot, the reply was, "well I'm IFR, I've filed a flight plan and I called whilst outside CAS".
So I think you will have to forgive those of us that make use of the term "remain outside CAS". I don't use it routinely, but if a pilot requests zone transit I will use the term until I've established the requested routing and identified the aircraft.