Groupy still very much behaves like a solitary app and does not integrate much with the regular interface. I think what many people generally request is a more natural way to use the features. Like: accessing groups from the taskbar, startmenu or tray; closing groups or windows etc.
The usage of tabs is expected to behave like well known from browsers where the feature is used most. Like: accessing tab-options via context-menu of the tab etc.
I am not quite sure why Stardock decides to solve most things via the three dot menu, that could be integrated more naturally in any element, that is provided by Groupy anyway. I find it better to "pave the cow paths"