You should learn whatever field you are interested in, doesn’t matter if others are already masters in that domain. You life shouldn’t be oriented around how you can be most appealing to capitalist companies, but instead what interests you.
Imagine telling students in school to not bother learning physics or calculus, as others have already mastered those fields.
Imagine telling students in school to not bother learning physics or calculus, as others have already mastered those fields.