At least, it would be good to be able to set the name of each window there. Names like "Window 1", "Window 2", give no information about the content of the window, and I guess most of the people that use several windows does it with the intention to organize/group their tabs in some rational way.
Also, with Group Tabs, this could fall into disuse, so..., there's another point to analyze there, maybe.
Absolutely! The recently added quickview for open/recently closed tabs is great, but I would appreciate the option to name open windows in order to more quickly switch between groups of tabs.