Many feature requests for Groupy are related to how we are used to use tabs in most common browsers. I believe Groupy should develop into that direction: tabs could be pinned, group sessions saved as sth. you open and close with on click. In the options you could tell groupy to open the set only with pinned tabs or where you left off. You could tell apps to always open with a [ + ] icon and even one window being tabbed - or not. While Explorer would benefit greatly from always having a [ + ] icon I would definitely not want that on a browser window that already has a tabbed interface. Also of course a browser window with many tabs only has one icon on the taskbar. Some browser (?) had/has the option to break that into many icons for many webpages open in tabs. Likewise this should be optional for window groups with Groupy. 

So far: the direction and grafical way to implement tabbing / grouping function is great, it looks really promising and is already way better than e.g. clover for explorer. The functionality still has much room for improvement imo though.