the work may have value even if it is not intentionally art by its creator — it may have significance as sketches or plans, works that are unfinished or striking in their construction even if the creator in question hadn’t intended it as such
Day 132 — Art And Intention

Sure those things may have value, but is that value as art or is it more valuable as insight into the artist’s process? Does such work stand on its own as art? Some musicians can play a scale more musically than some musicians can play a song, but that in and of itself does not make it a song.