Most drupal projects that we have created at communia require maintenance, and when the number of projects to mantain grow, a strategy is needed to carry out mass actions such as modules or libraries installation, upgrades, cleaning of caches or registries to monitor.

Until version 8, drush allowed to create alias and group them together to perform operations by group. For example, an @autoup group could be created that allowed updating the drupals that were known to have had no reason at all to give bugs in the update.