> Overlapping windows doesn't provide any benefit.
Another example: Overlapping my work windows over the Slack window. The red "you have new mention" indicator is a poor indicator for determining the importance of the mention; being able to see the channel it occurs in at a glance is very nice for prioritization. There's no real need to see the whole slack window.
I think this is one application of the “minimized pane” example the article showed: applications still have a way to show more data than just an indicator.
Alternatively, you could let panes be resized smaller than their “native width”, and get the same effect as overlapping.
Another example: Overlapping my work windows over the Slack window. The red "you have new mention" indicator is a poor indicator for determining the importance of the mention; being able to see the channel it occurs in at a glance is very nice for prioritization. There's no real need to see the whole slack window.