$wgAllowConfirmedEmail is equivalent to $wgGroupPermissions['emailconfirmed']['skipcaptcha'] = true; (see code) so there is no point in it existing; it just makes configuration more complicated. (Presumably the emailconfirmed class did not exist when it was added.) It should be deprecated and eventually removed.
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Event Timeline
Change 670490 had a related patch set uploaded (by Zabe; owner: Zabe):
[mediawiki/extensions/ConfirmEdit@master] Deprecate $wgAllowConfirmedEmail
Change 670490 merged by jenkins-bot:
[mediawiki/extensions/ConfirmEdit@master] Deprecate $wgAllowConfirmedEmail
Change 704196 had a related patch set uploaded (by Zabe; author: Zabe):
[mediawiki/extensions/ConfirmEdit@master] Deprecate $wgAllowConfirmedEmail
Change 704196 abandoned by Zabe:
[mediawiki/extensions/ConfirmEdit@master] Remove deprecated $wgAllowConfirmedEmail
Reason:
Deprecated in 1.36... Time for us to probably remove this (1.44 is cut, so would go in 1.45)
Change #1148406 had a related patch set uploaded (by Reedy; author: Reedy):
[mediawiki/extensions/ConfirmEdit@master] Remove deprecated $wgAllowConfirmedEmail
Change #1148406 merged by jenkins-bot:
[mediawiki/extensions/ConfirmEdit@master] Remove deprecated $wgAllowConfirmedEmail