Sure, no problem. I guess Emacs Lisp falls under the old-and-broken category. And Picolisp eschews functions as a data-type by choice. Do you know whether Picolisp offers lexical scoping?
As the other response says. The FAQ provides some rationale & makes it clear you can, actually, build robust software with picolisp's model of scoping. My understanding is, ``dynamic scoping is faster for an interpreter'' and ``funarg is easy to avoid and closures are possible''.