That’s a bit like saying that all languages with an imperative for loop keep reinventing FORTRAN. Although I give you that many of Lisp’s good ideas were unfash

That’s a bit like saying that all languages with an imperative for loop keep reinventing FORTRAN. Although I give you that many of Lisp’s good ideas were unfashionable for a while, reusing those ideas isn’t in itself an “ad hoc” implementation of Lisp.