A big difference with libraries is that (hopefully) a whole lot of other people have used that same library the same way you are going to use it for the same pu

A big difference with libraries is that (hopefully) a whole lot of other people have used that same library the same way you are going to use it for the same purpose you are using it for. All the significant bugs hopefully were found by them and the library was fixed. That usually makes it safe to use even if you have no idea how it does things inside. With AI code there is a very good chance you are the first person to ever use that code.