The benefit is that you can only use one window for every project instead of 2 or more.

What I usually do is have Vim take up the entire window and use floating terminals for background stuff which can be brought in and out of view with a hot key.

The floating terminals are stacked by default, but they can also be arranged side by side if needed.

I won't claim it to be a huge game-changer for productivity, but its definitely a nicer workflow for me.