People have been abusing blog software in order to create static sites since blogs were invented.
A wikiblog is designed to deal with this situation. There is no need to pretend that everything is just a blog post, you can design a site exactly how you want it.
In a wikiblog, unlike a normal public wiki, you have editorial control on each page. It's about ease of creation rather than getting strangers to write the content for you.
Think of it as a content management system that borrows as many concepts from blogs and wikis as it can.
Pagecake is not just a blog, it is a wikiblog.