This also sounds like a dealbreaker to me. When I'm at work, with my Macbook connected to an external monitor, I can put the inspectors on the 2nd monitor and have a whole monitor available to OG. When mobile, I just have the Macbook screen, and use Cmd-Shift-I constantly to show/hide all the inspectors. I don't want the inspectors to take up permanent room on the workspace, regardless of the size of my monitor.
Long ago I suggested they follow Photoshop's example, where you can show/hide all inspector panels by pressing Tab, or press 'F' to cycle through modes with more or less chrome, from windowed to full-screen.