It's the busiest developers who would be interested in receiving PRs. If they go unanswered for six months, it is a clear signal that there is something stopping else them from action.
It is also an opportunity for someone to feel involved and eventually join the group, perhaps even become a maintainer.
Speaking as a project maintainer that is starting to see some traction: I'd love to see people coming with PRs for features. It would mean a big amount of validation.
