To please the groups of users, it's probably a smart thing to give the groups system features like the ones taken away. We're not children.
I have no use for an email system with "less oversight" and virtually zero functionality, nobody does. Taking away functionalities because Yahoo decision makers at any level decide they don't like what the group is saying is detestable, infantile and on any planet except for Clown World Earth is unknown because on those planets the beings respect each other as much as they desire to be respected so everybody gets along and cooperates. -- What about Yahoo!?