Creating Office 365 Group should not create Planner plan
This appears to be a flaw that should be corrected. I discovered when I create an Office 365 Group in the Office 365 Admin Portal and add members, a Planner plan is created for group members. If there is a way to decouple Groups and Planner, how is this done. We do not want Planner plans created for every Office 365 Group that is created.
Pinky Pie commented
Ironically, searching for a reason why it does NOT create a plan for the group brought this thread up. Looks like MS listened to you. The plan is only created when you first navigate to "Planner" from the O365 Group in Outlook. If you try and add a Planner web part to the SharePoint site or as a tab in Teams and haven't already gone to Planner from the Outlook group you'll see there are no existing plans for the group/team.
Agree! Every group does not need a Plan and every Plan does not need a group.
I am with You!!!
Brajesh Ranjan Panda commented
Applies in reverse direction too. I have started hating this Group thing.