Why is a blog not just another article type?

My company has a content management system for publishing article-related content. The tech department considers a blog just another article type and wants to create a new article template that looks & feels like a blog. I consider a blog so much more – and I think the benefits of using WordPress would far outweigh the hassle of 2 content management systems – but I am stymied as to how to convey this. Anyone btdt – or any advice on how to make the argument to use WordPress instead of our internal CMS? Tia.