Why use Wordpress Blog if I have Discourse?

It looks like Discourse uses Wordpress for their blog on blog.discourse.org. Is seems redundant to me to have this here if it’s mostly replicated on https://meta.discourse.org/c/meta/blog and you are directed to go back to the forum to post comments. I wonder if Google thinks the content is duplicated, too, just seems easier to have all on Discourse in this case and lose Wordpress.