Writing “for the drawer” is generally a thing that happens if one is not yet satisfied or not confident about the quality of own output, or if one is self-censoring, or if one is expecting someone to read it eventually (communication can happen over time and space). I don’t think this is worth in-depth look, as art that was not seen by others for all intents and purposes does not exist.
(All art is communication; if you shouted into the void and made sure no one hears it, did it really take place?)
> void
Art as therapy, communicating with oneself. It's a specific case, though.
Writing in a journal is another example.
Interested in hearing your perspective on these.
> new data
We'll likely keep seeing it, up until the inflection point between "machines are for people" and "people are for machines." Along a spectrum, the latter being complete cybernetic mechanization of a life.