As a gatekeeper in an unrelated small project, I understand gatekeepers being selective. You have a vision, design standards, quality standards. Drive-by PRs that add "just this one thing I need" features is how your well-designed, cohesive project becomes a kitchen sink of shit.
> You have a vision, design standards, quality standards.
Unless, of course, all of those are shit, so a more design-competent person can drive by with an improvement, which will be rejected because it's too shiny
