DefaultController has been unused and effectively dead code since the initial port of this module to Drupal 8 more than five years ago.
This issue is to "officially" deprecate it as of 8.x-1.3 so that we can finally remove it entirely in 2.0.0.
Issue fork regcode-3471979
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Start within a Git clone of the project using the version control instructions.
Or, if you do not have SSH keys set up on git.drupalcode.org:
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Comment #4
tr commented