If we are to face the fact on this, that a post isn't open to new replies doesn't make the contents useless. It simply implies that the post has been discussed exhaustively and there is literally no corner of the subject in question that haven't been touched if one can go through the replies serially and for a thread with several pages, a lot of persons won't. Still, users bump into it every now & them and still get informations like you did. Though, your suggestion ain't a bad one as, it gives a clear directive on what to avoid.

I think this is the best way to have gone about presenting your new ideas so long as, it comes with more and more information and innovations on the context. It would be well appreciated.