We removed that, as well as many, many other UI elements, to simplify the experience on the embed. It should be doable to add that back to your site with a small theme component in the case that you need it.
As with anything new, we are trying to strike a good balance and ended up creating an experience that will make sense for most blogs, but Discourse will always be customizable as you expect it to be.
Interesting, will keep an eye out for this.