The main problem with finishing projects is that the fun 90% of the project takes 90% of the time spent on it, and the un-fun 10% required to actually polish and release it takes at least the other 90% of the time spent on it.

And then come the issues and PRs and people requesting your attention and time that they're entitled to because they found a project on GitHub that seems to fulfill 90% of their needs, and they only require you to implement or review the other 90%.

Keeping stuff unfinished is actually not a bad idea.