I am very happy Messenger Plus keeps adapting and improving to serve us all.

Unfortunally I'm really missing the possibility to ungroup one or two single chats. Very usefull if the webcam is running or in a busy chat.

In the Change log is sais that this is done to make the feature to be more "user friendly", however I don't see why this feature makes Messenger difficult to use.

Are you also missing the ungroup feature and why?

It was removed. You either use tabbed chats or you don't there is no inbetween. Don't know the reason why I think its because the less code there is to the feature the easier it is to resolve issues it may be added later but not yet.