But isn't this then just another tool that you're including in your project? I don't get why I would want to add this as a visualization tool to a project, if it's already using R, or Python, etc...

I mean, is it to avoid loading the full data into a dataframe/table in memory?

I just don't see what the pain point this solves is. ggplot solves quite a lot of this already, so I don't doubt that the authors know the domain well. I just don't see the why this.

Anything to standardise some of the horrifying crap that data scientists write to visualise something.