It looks to me that the maintainers straight up don't think the feature is important. But the author seems to miss the fact that by making a PR he is actually c

It looks to me that the maintainers straight up don't think the feature is important. But the author seems to miss the fact that by making a PR he is actually creating a burden for the maintainers. They are not in anyway obliged to merge it or even look at it. If he actually cared and wanted to contribute he would look for bugs not for new features. The way I see it new feature development is a right to be earned in a codebase you can't show up and expect people to review the code and merge it because it would look great in your cv or because it takes care of that one use case you care about.