I can’t stand it when an engineer wastes hours looking for a library, instead of even considering actually writing code themselves. Many just can’t because they’re so accustomed to glueing together other people’s code.
Of course, I’ve worked with academic types that can never stop theorizing and actually be productive. That have zero discipline.
There has to be a balance. But yes, fresh out of school == fairly worthless for anything I’ve worked on ever.
That's too little theoretical background, not too much practical experience. If you take someone with a good grasp of the basics, you will never remove that grasp by giving them more practical experience.
The choice depends not only on how complex your own code would be, but also how mature and well maintained the library is (e.g. maybe a library that's just right is some solo developer's pet project, whereas a slightly more awkward fit is actively developed by a big company). That is the sort of thing where making the right choice really requires a lot of experience.