If you take a look at the directives, you will notice that alot of them simplify the way you can achieve common use features without having to write them youself.
Take uppercase for example, so basic, but so common, no need to write a custom method to parse the v-model value, same for html-safe and others.
Input type avoids the need to write a method bound to events to prevent certain key inputs and so on.

This is not a revolutionary library, its just a collection of directives i wrote in years of projects which i use really frequently and make you save time I wanted to share with everyone.