And there are language savants who can be fluent in several languages yet having trouble with simple tasks with dressing themselves. More to the point, the process of acquiring language, where the complexity of grammar seems to be intuited in a highly implicit way and usually cannot be fully mastered after childhood, doesn't seem at like the kind of learning involved in job training.
Woj wrote:
Most people are not very far apart in their abilities and skills - as evidenced by the fact that all but the mentally retarded can fully master the most complex and comprehensive system ever created by humans - the language.