In reply to Matt.
Matt, with all due respect, why is “without a plugin” a paradigm to be desired? WordPress has a very modern and easy to use pipeline that is able to provide the best plugins with very little effort or technical hurdles.
The WordPress team is to be commended on perfecting the extensibility of their platform. Yet in the face of having the ability of adding plugins with ease, why point to this one feature and arbitrarily decide it should be part of the core, because we don’t want to use plugins?

We accept that there are some plugins that are essential to the experience, but remain as plugins. Akismet comes bundled with wordpress. There are two caching plugins that most people won’t do without one or the other. There is Yoast and other plugins which most would scarcely do without. And here is this upgraded CMS-like composition experience, which is already ostensibly a plugin, and it seems a foregone conclusion that this rises to the level of something that should be included without a plugin? This makes no sense to me. Please explain.