Sounds like a great idea! There could be a monthly or quarterly post to encourage people to link (or quote, if not too long) the various things they want feedback on in the response comments.

I did in a previous writing community run into the issue that people would, when somebody discussed general writing approaches, point back to their own previous feedback posts and find flaws in the posts to try to “prove” to them their more general thoughts on writing approaches was wrong. Which in my opinion scares people away from daring to post their work, when it later comes back at them in a more general discussion.

Therefore, I would only request people stick with “3. What happens in feedback or critique requests posts stays in these posts” which I suggested as a rule for that reason.