Comment by joe_the_user

I don't see how your linked comment brings more to the table than the basic arguments for code reuse.

But naturally, with any code reuse there's a benefit and a cost to instance of internal or external reuse.

The Benefits for external reuse include ideal reliability as your describe as well as not having to create the code. The costs for external reuse include having your code tied to not just an external object but also the individuals and organizations creating that object.

I think that means that unless someone takes their hundreds of modules from the same person or organization and is capable of monitoring that person, that someone is incorporating a layer of risk to their code that they don't anticipate at all.