You make it hard to hire if you limit the field to those who know the esoteric techniques. Programming itself is mostly a dead-end career; you either move into

You make it hard to hire if you limit the field to those who know the esoteric techniques. Programming itself is mostly a dead-end career; you either move into management or quasi-management, or face ageism on average. There is thus not a lot of incentive to "perfect the art".