I disagree that its pointless, as it does serve its purpose. Oftentimes other people have thrown new information to the threads, or have had one of your previous questions answered. Then instead of double posting you can respond to the new posts...especially if you are putting up a lengthier post yourself, and it might have taken you a little bit of time investment into whatever point you are trying to make.
Some people ARE here to actually put up thoughtful ideas, and not just turn this into Twitter or a chat-room lite experience. And we are LITERALLY talking about one more button click.....are you that fuckin lazy or lack such an attention span that one more mouse click in your day that takes less than 3 seconds to digest and respond to is actually an issue for you? Seriously?