We should not need to add system admins in order to manage group members. We are a large enterprise user and require co-owners. People are duplicating groups for this reason and this is not efficient.
This is a serious restriction and has had a big impact on how fast we can get new users into the right user groups to allow the correct access. SMARTSHEET TEAM, please make this a priority item.
Seconding all that has been said about making this a feature. Very inefficient otherwise. Please make this happen!