In a capitalist landscape we are trained to only ever be good at one thing. If you do more than one thing, you are worth less because then clearly youre not as good at your primary profession. Even if those other skills benefit that primary profession.

There are, of course, exceptions where managers understand that well-rounded employees provide a bulwark against mistakes and thus inefficiency. But for the most part, if youre not spending time on things that are not your primary responsibility, like learning tangential skills, youre losing them money.