Counterpoint: Breadth. (...Don't polarize on one end of the Specialist vs Generalist debate.) Since improvement of experience and quality of output is roughly

Counterpoint: Breadth. (...Don't polarize on one end of the Specialist vs Generalist debate.) Since improvement of experience and quality of output is roughly logarithmic, it is (depending on the specialisation of the task at hand) better to have a person that has worked ten years to be 7/10 in 5 displines than 10/10 in one and 2/10 in the remaining 4. Of course, if you only care about the one discipline, get the 10/10 guy. But in real use cases, things are only occasionally atomic, and lack of understanding of adjacent processes and disciplines can prove fatal.