The common training at flying schools is to go full rich on descent, and pulling the throttle back
Please, pleeeeease tell me that they are not teaching people to do this!
Wait - there is more. The common training at flying schools is to pick up a dropped wing with rudder at the point of stall
.
So many blatantly faulty techniques taught at flying schools and that hasn't change for decades. It all starts from the CFI with lack of supervision of his flying instructor staff.