[inigoesdr]

In general libraries are there to make your life easier and help speed up development so you don't reinvent the wheel. The issue is then that you have a dependency, so you have to be able to manage that going forward(including testing other versions usually). In my experience, people normally use libraries pretty heavily and don't rewrite the functionality using primitives unless there is a real reason that everything needs to be standalone(such as writing embedded software where there are space or other limitations).