I used LISP and APL professionally for, in the aggregate, over ten years. My current opinion on these languages is that software engineers would benefit greatl

I used LISP and APL professionally for, in the aggregate, over ten years. My current opinion on these languages is that software engineers would benefit greatly from learning and understanding them, yet it would be a mistake to use them for any modern work. When I say "learning" I mean in-depth application over, perhaps, a year, not something superficial. The question is how. I don't really have an answer for that. You have to find reasonably complex projects to be able to spend that much time with a language. That's the problem. I was getting paid to use these languages back then. Who wants to do non-trivial work in these languages today. Not many.