Transforming a sloppy drive-by patch into something which doesn't pile on technical debt is hard. For all but the most brilliantly architected projects, it requires someone who can keep the entire project in their head — a core maintainer.
The expectation that unlimited PRs will be reviewed for free is corrosive and contributes to the core-maintainer burnout described in the article.
This is something that can lead to angry interactions between maintainers and pull request raisers. Never mind adding technical debt, pull requests can outright break uses cases they don't care about in order to implement the single use case they do care about.
raiser: "Merge my PR. It fixes this issue."
maintainer: "It fixes this single issue but you've broken this for everyone else."
raiser: table flip