When it comes to SEO best practices, it's quite common for expert comment/opinion (and I'm including Matt Cutts here) to refer to the importance of the site's blog. When I see the word "blog" I understand it to mean a part of the site created by an application such as WordPress, Blogger, Tumblr etc.
I find most blogs to have lightweight, fluffy entries that don't really enrich my viewing experience. I've never been convinced that my site subject matter gains anything from tacking on a blog. My preference has always been to expand the unique information on the site. That may involve adding content on an existing page or adding new pages. It might also involve adding article pages about topics related to the site's subject matter. e.g.
"A Visitors Guide To The Widget Valley" would be a page of content.
"Recommended Day Trips To The Widget Valley" would be an article page, possibly authored by a third party.
"Best Family Camp Sites In The Widget Valley" would be an article page, possibly authored by a subject expert.
However, this approach is essentially expanding evergreen content that seldom, if ever, varies or requires updates. Blogs on the other hand are supposed to be the platform for adding fresh content and keeping the site current.
In the above scenario it's easy to see that the two article pages could also be blog entries.
Question: From a purely SEO and ranking perspective, do you think it's possible that having a genuine blog provides any advantage over an arrangement of article pages?