The config that sets DefaultUserOptions['discussiontools-autotopicsub'] to false should be moved to WMF's mediawiki-config repo. Out of the box the extension should enable all features for all users by default.
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Change 771872 had a related patch set uploaded (by Esanders; author: Esanders):
[operations/mediawiki-config@master] Disable autotopicsub user option by default
Change 771873 had a related patch set uploaded (by Esanders; author: Esanders):
[mediawiki/extensions/DiscussionTools@master] Enable autotopicsub by default
Change 771872 merged by jenkins-bot:
[operations/mediawiki-config@master] Disable autotopicsub user option by default
Mentioned in SAL (#wikimedia-operations) [2022-05-24T21:34:57Z] <cjming@deploy1002> Synchronized wmf-config/CommonSettings.php: Config: [[gerrit:771872|Disable autotopicsub user option by default (T297966)]] (duration: 00m 48s)
Change 771873 merged by jenkins-bot:
[mediawiki/extensions/DiscussionTools@master] Enable autotopicsub by default