User blog comment:MisterWoodhouse/The first specifics on the Unified Community Platform/@comment-37906621-20191027184709/@comment-24006128-20191027185300

We're updating the underlying software for the entire platform. The code for these features in question is not viable for the new platform. Holding an entire upgrade back for the sake of these features would be a colossal disservice to the millions of users who will reap the benefits from 7 years worth of MediaWiki improvements we're getting in the project, along with improved access to extensions and the ability to build awesome brand new features, rather than being held up trying to backport security fixes onto a heavily forked version of old software.