"why all this study of the Heideggers, the Lacans, the Derridas" I can't speak for anyone else, but my interest in Heidegger dovetails with my interest in Asia

"why all this study of the Heideggers, the Lacans, the Derridas" I can't speak for anyone else, but my interest in Heidegger dovetails with my interest in Asian and Indian religion and philosophy, and with my interest in the illusory nature of the world and what lies behind the world of appearances. I'm not interested in Lacan or Derrida, so will leave them for others. "What does it really contribute to humanity?" Is having one's eye's opened or seeking ways to open one's eyes useful? Does something have to "contribute to humanity" in order to be of value? What did the Mona Lisa or other great works of art contribute to humanity? Should Beethoven never have written a note of music because none of it is useful? Or does Beethoven's music's use in parades finally justify its creation? Can philosophy, like art and music, somehow connect us or open us up to the core of humanity or the world? Is that useful? Does it have to be?