I guess I just wish Moodle would automatically monitor things like when faculty set a forum to use groups, but they don't have students in groups. A forum set to use groups will prevent any and all students who are not in a group from using that forum. Consider this common scenario:
A faculty member with a course that does not use groups turns editing on in their Moodle course, they move their mouse to click the Edit button to the right of a forum, and accidentally click the gray person icon for "No groups" instead of the Edit button. The group icon changes to "Separate groups" and suddenly that forum ceases to be usable by students since they are not in groups.
We have tried to mitigate this mistake by changing the group icons from all one color to different colors. Screenshot in the attachment field below. But still, I wish Moodle would say, "Hey there, looks like ya just set a forum to use groups, would you like help to actually make those groups?"