To me, these things are a way to improve process. Making thirty works in thirty days will identify points where there is wasted energy or where unfamiliarity with tooling exists or where insufficient consumables are an impediment.

A person making thirty songs in thirty days will get better at setting up gear. Turning on the recoding device will be normalized. Not keeping enough blue gel pens at hand will become obvious.

And it can all be in addition to time spent on a master work progress.

Or maybe while everything is ready to go, it becomes easy to lay down a take of the master work.

Working little things end to end is a good way of developing a habit of finishing. A perspective that is less precious. A catalog of experience. And questioning absolute links between effort and quality.