I agree here, but it would be very useful for some types of blogs to be able to use a theme that could break posts up into sections. It would be bad to force that on all themes, but the option would let you have a theme that splits up, for example, latest posts, posts about family, posts about philosophy, my art, etc. I think the single-feed is the correct default, but having some organization would bring in a lot of people who need more, especially (but not only) larger publications.