Now imagine you didn't had to learn one language but 2 or 3 or 40, that's pretty much what your are advocating, regardless if you do it for the sake of cultural

Now imagine you didn't had to learn one language but 2 or 3 or 40, that's pretty much what your are advocating, regardless if you do it for the sake of cultural variety or for the sake of making it harder for programmers to communicate with each other.