I see what you're saying and if you're careful you would have already made sure your post title was SEO'd.
Very well. I truly believe as you do that most of the SEO needs can be/are taken care of with wordpress but also believe there are still some tiny but essential 'SEO things' one can do to a page or post that neither plugin could take care of automatically such as bolding or italicizing certain words.
Again though, I mostly agree with you. I haven't seen one other CMS that seems to offer so much for SEO via plugins and in it's initial install too.