Here’s an example of window friction:
In single window mode, if you close and open your tab again, things are, for the most part, where you left them. Currently, that doesn’t happen with multiple windows (ie, tabs). This would almost need to be implemented using some of abstraction like ‘windows,’ where you could define “This is window 1 of my workspace” and “…window 2…”, so that you could have two windows open at work, then come home, and open up two tabs, select a window for each, and have the same two monitor set up.
This would be killer for me, as one of the best features of using this IDE is being able to close my work on one computer, and continue on (without opening any new files, arranging tabs, etc) on another.