This task now an RfC to merge a patch, because People Were Concerned. For a full overview of why we want to do this, including the background of themes, skins, and what all that means, please see the [writeup on mw.org](https://www.mediawiki.org/wiki/Requests_for_comment/Themes_in_core).
What we're proposing is this:
# **Merging the linked patch to merge Extension:Theme into core.** Under wider review, do we have consensus (or at least no objections)? Does anything need changing?
# We're also a bit fuzzy at this point what we actually intend next, so further discussion of //that// is probably very much in order here as well. That, or we can just worry about that later when someone has more time/some actual resources to do... whatever it is. At least putting //this much// in core means we'll have much more consistent handling across skins regardless of what we do next, as they will not longer need to depend on the extension or roll their own.
Some discussion has also occurred on the related [talk page](https://www.mediawiki.org/wiki/Talk:Requests_for_comment/Themes_in_core) onwiki, but let's continue future discussion here for consistency, as this was the original task for the patch, and phabricator is just less annoying in general.