I think the point of the tabbed windows isn’t so much window tabbing, as the idea that the window belongs to the user and not the app. The user manages windows

I think the point of the tabbed windows isn’t so much window tabbing, as the idea that the window belongs to the user and not the app. The user manages windows and not apps. Currently, this is being leveraged in tabbed apps, and in the ability to open a window, resize it, etc and then decide which app should show itself in that tab of that window. But the paradigm change itself could potentially lead to new workflows, etc if creative app developers and designers really start working woth it.