Drupal CMS previously hacked a --generic option onto drush config:export. When run with this option, config would be exported without UUIDs or _core elements.
In Drupal CMS 2.3.0, this feature is removed with no replacement. Its use case is limited; the main reason to export config generically is for use in a recipe, but the entire site can be exported as a recipe with Drupal CMS's site:export command, and drush config:get never supported --generic anyway.
Additionally, there is no clear way to implement --generic for the dr config:export command added to Drupal 12.1, which will replace drush config:export, and which does not (at the time of this writing) support exporting config to an arbitrary directory (normal config exports for syncing purposes should never be generic).
With no ability to support it in the future no clear use case, the option is removed.
