I get why they put a gap at the top of the posts & pages in the Twenty Fourteen WordPress Theme, but it’s a little inconsistent (aesthetically speaking). The gap does make blog posts without a feature image look just right, and fit & flow they way they should.
If, however, your post has a feature image, it just looks awkward (to me, anyway), and as the goal for me is try to to always have a feature image for each blog post, I decided to go ahead and remove the gap.
It’ll also force me to update those older posts at some point to add a feature image.