What's the difference between local actions and local tasks in Drupal 8?

Actions “define local operations such as adding new items to an administrative list”, and are shown . Tasks generate the tabs on top of pages (up to two levels). These are mostly used on administrative pages but frontend pages like user pages or the registration/login/new password pages

https://www.drupal.org/docs/8/api/menu-api/providing-module-defined-local-actions https://www.drupal.org/docs/8/api/menu-api/providing-module-defined-local-tasks

Here’s a module to allow people to configure local actions (in Drupal 7):

https://www.drupal.org/project/local_actions

A combined local tasks and local actions module would be nice for Drupal 8, thoughthe nice thing about Drupal 8 is these are defined in dedicated yaml files, and a module to make them configurable through the UI couldn’t do that.