Hello! Author of the library here. Just want to point out that I am a journalist and very active in the data journalism community. (6+ years) Both the sites you name-check have journalists who do production online graphics that don't go through the traditional Illustrator workflow and news organizations are increasingly discarding that antiquated pattern. (I've made a hundred graphics for NPR and I don't even have a copy of Illustrator installed.)

To your second point, that's fine. The most common feedback I've gotten is "I don't see what purpose this serves that X doesn't already fulfill!" Well okay then, you don't gotta use it. But given the fact I've done this job for years, working with the very folks who it's targeted at, I think it's probably safe to assume I've got some reasons. (Which you will find enumerated in the blog post and documentation.)