Jeff Geerling, currently working as a technical architect at Aquina, wrote a good post on when and why he closes PRs to the packages he's maintaining. This paragraph resonated with me.

I don't cater to everyone. I usually cater to myself. And for 98% of my OSS projects, I'm actually using them, live, in production (often for dozens or hundreds of projects). So I'm generally happy with them as they are. I will not add something that increases my maintenance burden unless it's very compelling functionality or an obvious bugfix. I can't maintain a system I don't fully understand, so I like keeping things lighter and cutting off edge cases rather than adding technical debt I don't have time to pay off.

http://www.jeffgeerling.com/blog/2016/why-i-close-prs-oss-project-maintainer-notes