It seems like an invitation to explain what this package brings to the table that others don't. You don't use a piece of software just because it's newer than the alternatives. I'm not familiar with any of the libraries mentioned, so any response would be more information than I currently have.
It's unfortunate that their phrasing could also be interpreted as an attempt to question the usefulness of the new library, and might be read that way, depending on how obvious the reader thinks that the answer is.
I'm exploring a bunch of libraries right now and would like to know what advantages / disadvantages each lib has over one another.
It would make all our lives a lot simpler if every new lib comes out with an explanation of its differentiators.