I can understand the confusion. There is a lot of capability here and being used as a blogging platform is one of the things it can used for. The intention here is to provide for a way to show collections or groups of small units of conten. Blogging is an activity that has categories and hierarchies so it can be done using this platform. The value proposition is that its a better way to showcase collections of content. With many micro blogging platforms and the like it's quite difficult to find older posts or particular information sometimes, there's also some platforms where the focus is on what is currently the latest and everything else is old and more cumbersome to locate. Cards as the smallest unit of data are great for being a container for a mixture of imagery and text and something everyone is familiar with.

There is a need to add more polish, are you looking at the web site or app?