For me, it would definitely be edx-platform. Right now there’s no good way to determine 1. Who should review, and 2. Can a CC review and merge on edx-platform (if we know a CC has expertise in a particular area).
@nedbat currently I run the OSPRs that need review on edx-platform by Ed, and he helps to guide me to someone to review/merge. Would it be helpful to post these in the Maintainer channel instead so you can weigh in too? I typically do them in batches every couple of weeks.