I agree with this to the extent that "open source your library" means "publish it on Github". Adding it into a package management system, be it one for a language or one for a Linux distro, is implying some level of stability and functionality. This is especially true if you choose a desirable namespace for your project on a system that doesn't differentiate by username.
Essentially; do publish all work you possibly can, simply be clear about what the software does or does not do.
I am very guilty of not doing this myself. I throw together some bit of code that is useful to me, and dump it on github with no explanation of what it does or how to use it.
As a bad example, I'd encourage everyone like me to put in a bit of effort to explain what your code does, so that when someone stumbles across it they have a way to give it a try and see it doing something.
If you want to others use it, then document it. I really appreciate it. Otherwise, if you only wrote it for yourself you did enough. Undocumented code is better than no code. If you didn't publish at all I would have to start from zero.
Essentially; do publish all work you possibly can, simply be clear about what the software does or does not do.
I am very guilty of not doing this myself. I throw together some bit of code that is useful to me, and dump it on github with no explanation of what it does or how to use it.
As a bad example, I'd encourage everyone like me to put in a bit of effort to explain what your code does, so that when someone stumbles across it they have a way to give it a try and see it doing something.