As I have posts nested into Pages, I should be able to have pages nested into pages and the menu look the same??
You have a static "About" page as your home/front page. You have a custom menu with all your posts, with a submenu of the posts according to categories.
That is actually a good seo structure for a blog that you want to be easily found.
And you are not using any widgets so there are no distractions from your posts.
IMO, the wide text is difficult to read, especially white on black. Better narrower, and/or broken up with some pictures. And some widgets are useful: recent posts, recent comments… just IMO