Providing Students Formal Exam Feedback?
One potential drawback comes to mind: if you release the rubrics and/or each student's assessment against these rubrics (it's a bit unclear to me which one you want to do), you will open the gates wide to long, tiresome discussions.

If students don't know the rubrics against which their work is assessed, they will have a harder time arguing that "obviously they addressed this topic, so they should get full points."

(I'm not arguing against releasing rubrics and/or assessments just to reduce the teacher's workload. I'm pointing out a potential downside. I'd still argue that releasing at least the rubrics makes sense to help students improve. Just be prepared for discussions. A small percentage of students can be very tenacious in such discussions and appear to spend more time disputing their grade after the exam than preparing before.)