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IMO, a small screen like that of my MacBook is exactly where inspectors make the most sense. If the information in a typical inspector view is always in view, I wouldn't be able to see as much context, or the display would be undesirably cluttered. The inspector approach allows me to spend that real estate only when I need it, and in a fashion that isn't constrained by the need to fit in a border to the normlal view.

That's not to say that the friction in the current implementation couldn't be reduced. A keyboard shortcut to change focus to/from the inspector is something often mentioned as a potential improvement.