I think I can support this notion with something a little more concrete. I program C++ (13 yrs) and I learned javascript and web dev 8 years ago. don't consider myself a master at either. But, having broad coverage over and aptitude in both of these realms has had a huge impact on my ability to make an impact in the real world, working at a robotics company that heavily leverages these technologies. There are large rifts between teams that form due to the relative scarcity of "cross-pollinated" contributors.
