While full spin demonstrations are useful in early training so that students understand them including how to recover, the hazard of emphasis on keeping the stick all the way back on entering a full spin is that it builds muscle memory that can kill you in a spin entry turning base or final.
The ground will get in the way of a recovery from a low level full spin.
The emphasis needs to be on never allowing a wing drop in the circuit to develop into a spin.
We lose many more pilots from spins in the circuit than spins from altitude.