alt Hacker NewsI some times will open a PR even if i know it will get closed, simply by because if its a bugfix or feature i want, someone else might do so too, and i have many times adopted code from PR's that were never adopted by mainstream or closed.
By pushing that PR, i might be annoying a grouchy maintainer, but at the same time helping tens or hundreds of other users of the software.
Imho the beauty of open source is as long as you're adhering to the licenses, you can do whatever the heck you want =)
If you already know it's not good enough, you can just say so by calling it a proof of concept or hack to demonstrate what needs to be done. Such code is often very useful when writing the real fix.