Currently you can only edit the blog listing head and the blog posts head shared for all posts. It would be nice to be able to go into a post and edit that individual posts head information.
1 example use would be to edit the social meta tags if you would like to preset an image that doesn't match the featured image or social descriptions that don't match the meta description.
There are numerous other specific situations where editing an individual posts head information would be necessary. The functionality could mimic that already used for website pages since you can edit each website page individually.