The real reason is that companies don't want to implement the systems required to hire a more diverse workforce. Their success depends on having an extremely narrow band of aptitudes.
Greyston works because they make no assumptions about the type of person they receive. Because of that, they need systems surrounding each individual to ensure they're successful at all costs. And they have them.
The latter can be far more effective, but requires a broad humanistic approach that very few people, businesses, or cultures in the world have. The chance of transformation is extremely low, and the costs extremely high, so the resistance is nearly insurmountable, companies take the traditional (chaotic) approach, and we suffer for it.
Greyston works because they make no assumptions about the type of person they receive. Because of that, they need systems surrounding each individual to ensure they're successful at all costs. And they have them.
The latter can be far more effective, but requires a broad humanistic approach that very few people, businesses, or cultures in the world have. The chance of transformation is extremely low, and the costs extremely high, so the resistance is nearly insurmountable, companies take the traditional (chaotic) approach, and we suffer for it.