I think its embedded into the "maker" mindset in general and does not necessarily have to be one way or the other. It's both.

A writer can have lots of poetry, personal expository essays, journals, unfinished drafts lying around OR s/he can "ship" a best-selling novel, publish a high-traffic blog or something.

Similarly, a painter would experiment with lots of techniques, colors, textures "on the side," again having lots of personal work lying around, yet would probably treat something s/he would put in an exhibition differently.

In the first case, you are experimenting, discovering, breathing; while in the second case you have to think hard about your audience, your readers, or your customers.

It's built-in.