One big missing part of the Group module is setting up friendly URLs that contain the group in the path for group content. You can't set this up in Pathauto -- the tokens are too limited to handle this correctly.
Group
🕑Aug 05, 2017 🖋John Locke
💬2
Getting the group into the URL with Purl
The corners of Drupal 8 that aren't there are quickly dwindling, but there are still some that need to get worked out. While upgrading our internal issue tracker, we hit a new one -- getting a group context set via a URL alias, and generally keeping posts within a group.