Let me be clear, I was perhaps addressing the parent more literally than I should have, in the broad sense of cross-domain learning for the sake of learning. I

Let me be clear, I was perhaps addressing the parent more literally than I should have, in the broad sense of cross-domain learning for the sake of learning. I agree wholeheartedly that the opportunity cost of that learning should be taken into account, but my earlier point was made with the implicit assumption that there are methods that don't come with such an overhead. (e.g. choosing to take Latin during my CS degree would not have meaningfully changed my costs had I cut it out, and the benefits have become increasingly clear over the years. Most of this learning, however, I'd say has taken place outside of any institution that incurs a monetary cost, and the minor time-cost is largely what I was defending)