>Wouldn't it make sense to have the terminal in a tab, next to the browser tab?
Yes, the operative word is next to. This is already possible with any of today’s window managers (just drag the windows next to each other). In fact, certain tiling window managers (e.g. i3, notion) make it possible to permanently place the terminal as a tab next to the browser window, and move the two around as a unit.
You still haven’t made a case for arbitrarily nesting windows, which was the feature desired in your original post.
Yes, the operative word is next to. This is already possible with any of today’s window managers (just drag the windows next to each other). In fact, certain tiling window managers (e.g. i3, notion) make it possible to permanently place the terminal as a tab next to the browser window, and move the two around as a unit.
You still haven’t made a case for arbitrarily nesting windows, which was the feature desired in your original post.