I was mostly thinking of e.g. the C++ Standard library, or a TCP library, or a multithreading framework. And really, by re-using that code I mean using the lib

I was mostly thinking of e.g. the C++ Standard library, or a TCP library, or a multithreading framework. And really, by re-using that code I mean using the library. Now, most `libraries` don't fall under this category. But for libraries that are truly going to be used, especially if they are used in multiple different organizations, separate from the library writers, then this matters. To your point though, these library writers aren't delivering a what a lot of people think of as a `software product`. I would call it more of an intermediate-product than an end-product.