A good paper will describe how the work is interesting or useful in the field and how it opens the door for future research. Here the author acknowledges that

A good paper will describe how the work is interesting or useful in the field and how it opens the door for future research. Here the author acknowledges that other libraries may be more performant, but describes the motivation for the work as essentially something that’s a small piece of code to maintain, and easy to use. I didn’t run the code but I read through the paper and it doesn’t seem like it’s made a convincing case for this.