Just saying that our involvement ends after making a recommendation to you - it's between you and the writer then, whether you want to work directly with them, contact them, or not. We don't act as go-betweens or anything like that (probably obvious but just wanted to clarify that).
Yes, I'm not asking you guys to do any grammatical editing and/or proofing. You also are not obligated to offer every single review submission feedback. Some writers will be beyond our scope of help. A lack of response on a review is essentially its own type of feedback.