I’ve noticed this among scientists and people in IT, too.
It’s not just lack of time, most often. It’s extreme incuriousity and even disdain for anything that can’t be neatly defined in an equation or some other “empirical” systematization.
But when I get that big promotion at work even though I am not technically as good as you, here’s why: I spent a whole lot of time studying sociology, psychology, writing, politics and anthropology (and many other fields) so that I can find out what my boss needs and do it before she even knows she needs it, and I can write a damn nice business case that people ask me to use as a template for all other company business cases. I can also outmaneuver the galoot in the other department who is attempting to sabotage my work using my knowledge of psychology and sociology, and in addition I can gauge the tone of a meeting better than most of my peers using those same tools and get my way far more often than I would otherwise. Furthermore, I can in my own field and quite a few others ascertain the rough directions they are going to determine how to position myself better for the future.
None of this I would be able to do if I hadn’t intensely studied other fields other than my own on my own time. Absolutely none.
And these are just the ones that help me at work — others such as ecology, literature, critical theory, genetics, biochemistry, philosophy, linguistics, philology, paleontology, geophysics, neurology, aircraft design and so many more just made me a better and more capable person in general.
A silo is fine, if you want to be constantly confused, bamboozled and befuddled by the world.
Otherwise, step out. Step the hell out.