There are already problems with the comment system that the main page already has. Now, you have the ability to post comments about the news that is posted, and people tend to abuse it. You get people that pose as Moderation staff, people that spam...ect.
If people just make topics about it on the forum, the Moderation staff can more control of whats said and to my knowledge, more people enjoy posting on the forums, rather than using the comment system thats implemented on the main page.
Perhaps if a thread were created in ESF Chat, and clicking on the comment link on the main page would direct you to the topic on the forum. That would be more suffice in my opinion.