Technique must be the servant not the master. Within reason teach the athlete WHAT to do, not HOW to do it. Give them enough information and direction to allow them to solve the particular movement problem, then get out of their way and let them discover the way that works for them. Don’t turn them into robots by forcing them into a specific technique. Help them achieve good technique with being overly technical. Provide just enough direction and correction to spur their creativity.
Remember the story of the centipede:
There is no one "correct" technique, each athlete will have their own way of expressing the technique demanded by the sport - that is called style. Everyone has a movement signature or a movement fingerprint that makes their movement unique, recognize that and build upon it to achieve the required technical competence.