User blog comment:DaNASCAT/Technical Update: May 6, 2014/@comment-1192804-20140507191529

Great, now hundreds/thousands of wikis with editors who don't like having "Added by username on Month, Day, Year" (is having the upload date of the image in articles REALLY necessary?) will have to update their code.

Ugh.

You couldn't have just added dual support for both .picture-attribution and .attribution?