The abbreviated call sign and the position in the circuit is all that should matter to other pilots. A few exceptions: " G-AB Downwind glide approach", G-AB final land/touch and go"; the occasions when a standard circuit is varied. Knowing whether the aircraft is a PA28-140 or a PA28-32 is of little identification help. To be able to identify any light aircraft 3000ft ahead is as unlikely as doing the same should it be flying overhead at 3000ft. Turning RT into a chat room is a disease of our time and there can be no end of it. The advantage if required of knowing the type is perhaps with ATC who can employ binoculars to look out the window.
Joining correctly, flying an accurate circuit pattern and a thorough LOOK OUT is where the effort should be.