Two categories of productivity

A few years back I would look at my time spent in terms of whether I was spending it on consuming things, like information, or producing things, like writing and coding. While this is still a factor, I've recently shifted to a more helpful way of looking at productive time.

If I get a bit more granular on time spent producing things, I've learned there are two broad categories of productivity. Am I maintaining something already in place, or am I advancing into new territory?

Maintaining something is easy to do, takes little effort, and is not difficult to do with music playing in the background. In fact, music might make things easier to keep moving.

Advancing, on the other hand, is hard. It's new territory. It takes a lot of effort. Specifically, it needs lots of concentrated time of focus, and that's not easy to find.

Interestingly, while a personal goal would rightly be to have more time to focus on deep work, the project goal is to shift it from being new (advanced) to being something productive (and maintained).