I get that. As a robotics engineer, some cursory understanding of integrals and derivatives is useful.

But what I really mean is that, as a person, I just really enjoyed calculus. I found I was very good at it, and that experience helped me understand why some people choose to focus their career on pure mathematics. I am happy I took calculus not as a means of training for the workforce, but because I found it enriching on its own. And I never would have taken all that time if it wasn't offered to me as a class in public school that counted as credits towards graduation.