For someone who has never used wordpress before, it can be hard to get started. Understanding the difference between a tag and a catagory. navigating the menu. Compare it to tumblr. Tumblr has a much better user experience.

It is possible that we don't know yet (at least fully). If the community never tries other things it is unlikely to ever find out.

You couldn't possible be claiming that the Wordpress interface is the pinnacle of UX research and advancements. Its fine. Just fine.