If I'm missing something here...... then how can I create a group?
Good news! You can already create a Family Group. Here are the instructions: https://www.familysearch.org/en/help/helpcenter/article/create-a-family-group
However, if you are referring to creating a group here in FamilySearch Community, we cannot do that.
There must be a way.....
Nope, sorry, there isn't. (Not anymore.) Only FS staff can create or modify Community groups.
Over on the main FS site, you can create a family group (https://www.familysearch.org/en/help/helpcenter/article/what-are-family-groups). Would that suit your purpose?