There is "What you say" and there is "How you say it" .
Suggesting there should be a time period for members to edit posts for grammar, content, etc. is fine. I support this. Many forums allow a certain time period before posts are locked. I cannot tell you how many early morning and late night replies I've made on forums where I look back and wonder what was I trying to say?? Sometimes a bit of judicious editing and clarification is necessary.
There is nothing wrong in expressing this. However..Walking into a forum with its particular software set-up, regulations, social dynamic, etc. and launching into a tirade about how "screwy" they place is, and the moderators and members who are not online, and I don't care if this sells... is a load of baloney!
You're going to get a much needed strong response from the group.