[0d9eooo]

I agree with your point re: the depth of information in a field making it difficult to maintain competence in multiple fields.

On the other hand, I think society increasingly projects an expectation of this, that someone cannot possess skills in multiple areas, where areas are increasingly narrowly defined. I think in part this plays a role in stress over higher education, in that a degree is seen as a skill certificate (that is, a statement about what someone can do) rather than an opportunity to learn (that is, a statement about what someone has done).