My father, who instructed a LOT during WWII, never returned to instructing as a career.
But he remained a resource to other instructors for another 40 years, often taking problem students and using his patience and observation skills to help them through their troubles.
At least half the time the student wasn't doing well in approach/landing, and Dad always addressed this with a period of slow flight, including approach turns & transitions from cruise to slow flight and back. This led the student to a level of comfort in that regime, which always helped the approach/landing problem.
(I should add - for a time the WWII AT-6 Texan/Harvard syllabus included placing a mask on the airspeed indicator so one could not read any speed below 90 kt IIRC, so only tactile and attitude cues were available to the student)
In fact, that's how he and I always checked out a new a/c type: Head for a healthy altitude, practice stalls & stall approaches, & turns in approach configuration, to see how honest (or not) the airplane behaves.
