is zen just "this"?

Besides koans which try to break conceptual thinking, or Zazen practice. does zen not teach anything because all there is, is "this". Furthermore, to rely upon such a term, you cannot hold it as an ideal or concept, but instead a direct pointer to the present moment reality (because if you hold "this" as an ideal, it will create duality as you rely upon it, instead of clarity).

what are your opinions? iv heard people describe zen as "just sit", or "it just is"....