I might be slow and the fact is I am not a programmer.
However having used WordPress for so long, the single most feature of customising the theme seems to be out of the window. This was disappointing.
I will give it a few more months to see if it improves. In the meantime, I am reverting to Twenty Twelve. This is for the first time in my relation with WordPress that I am so grossly disappointed.
Twenty Thirteen is a very clever theme. Clever in the aspect that the to make the changes I want, such as a category page that shows a thumbnail image of the featured image on the left side and an excerpt of the post has as of this review not been completed. Those who created the theme got clever. Which means spending countless hours figuring out just what changes in the child theme has to be done to get the changes I want.
I've made some changes, but my goal was content. Not fixing another theme because the creators of it decided to get clever. It's annoying. It's like they didn't want changes to be made which defeats the whole purpose of WordPress.