Hi,
I've written an RfC about moving most of the Echo extension code into
MediaWiki core:
<https://www.mediawiki.org/wiki/Requests_for_comment/Notifications_in_core>.
RobLa has written a summary of it on the Phab task:
<https://phabricator.wikimedia.org/T128351>.
Feedback is appreciated. :)
-- Legoktm