There's nothing wrong with spending a couple years writing glue code. Nor is there anything wrong with spending a couple years using an operating system before

There's nothing wrong with spending a couple years writing glue code. Nor is there anything wrong with spending a couple years using an operating system before building your own. There are plenty of libraries to write that haven't been written yet, yes, DB abstraction layers have been done to death, but I'm sure there's still a better way to make CSS sprites, or platforms for which ANY library is not readily available. In my opinion, "If I have seen further, it is because I stood on the shoulders of giants".