Simulator training must be done in parallel with real flying exercises.
Real G's must be experienced, situational awareness in a 3d scenario must be instilled. And then there is fear, fear IS the leprosy of aviation.
Fear and panic, together with lack of skills are responsible for most if not all UPRT LOC accidents aside from LOC in IMC.
Fear leads to mental blockage and motion paralysis, it can only be tackled successfully by venturing into unknown territory, not in a sim, but on proper aircraft with competent instructors.