Its a little funny that most of the points are stuff people write about the Customizer, which he supports. Also header, background and thumbnails alters the UI.

The point about using categories, taxonomies that would make it even more different between themes.

The only criteria would be does the feature add value to the end user. Yes, no. Is there anything that can be done to make the value more clear, is it worth the effort. If no then remove.