I'm not sure I see any advantages of having a window with multiple panes and tabs instead of a separate window for what would be in each pane or tab? I can easi

I'm not sure I see any advantages of having a window with multiple panes and tabs instead of a separate window for what would be in each pane or tab? I can easily alt-tab between windows on a workspace (and ctrl-alt-arrow between workspaces) and I can cut and paste between windows. I only need to use a mouse when I am forced by necessity to interact with the cartoons in a browser window or to play the red 10 on a black jack. Can anyone elaborate on the advantages to using a single mother application to house all my command-line interactions instead of separate application windows for each?