This might be an epic task that is very hard to fix but let's document this problem at least in public.
This is one outcome from {T113378}.
There seems to be unclear responsibility for some parts of MediaWiki core so nobody looks at its proposed changes in Gerrit.
Related links:
* [[ https://etherpad.wikimedia.org/p/newcoreteam-unconf | "New core team?" meeting: Etherpad log ]] from Wikimedia Developer Summit, 2016-01-06 unconference day
* ~~[[ https://office.wikimedia.org/wiki/Engineering/New_core_team | Internal / non-public WMF page that brought up the topic of WMF's Core maintenance ]]~~
** https://www.mediawiki.org/wiki/Talk:Wikimedia_Engineering/2016-17_Goals/New_MediaWiki-focused_team
* [[ https://www.mediawiki.org/wiki/Wikimedia_MediaWiki_Core_Team | Old MW Core team page with its responsibilities ]]