As much as I would like to agree with you, ultimately what we want to see are posters who genuinely want to make a change, but also take into account other considerations into their suggestions.
While I agree that it does take some experience in terms of gameplay time to pass off such judgements, I don't think it's entirely feasible to quantify such restrictions onto forum members.
To me, as long as a suggestion makes sense, it takes into account others' considerations (rather than the poster merely advocating his own selfish concerns without sparing a thought for other players or OOO), I'm fine with it. You don't necessarily need to restrict new players' freedom of speech, but find those posts that are worth commenting on - hell, some new players can make very pertinent points.
I know you're irked; I do get that from time to time skimming through senseless posts. But right now all we can do is filter out the posts that are worth commenting on, and so far it seems to work relatively well.