I think it's telling that while there are Lisp aficionados in this thread telling us how great it is, none of these ideas have been implemented in Python or Jav

I think it's telling that while there are Lisp aficionados in this thread telling us how great it is, none of these ideas have been implemented in Python or JavaScript or Ruby, the most common dynamically typed languages. And that's really all I care about, I'm not about to start writing production code in Lisp.