[nooneelse]

> ... requires a set that fully surrounds the camera position ...

The scenery 'behind the camera' could be composited in.

And other tools might work well to focus the viewer's attention in new ways. Like lighting the important actions and bits of dialogue with brighter lighting than the rest of the view, or a slightly different color.

Imagine an episode of Sherlock that had the world slow down and such a lighting effect that acts as the 'light of Sherlock's attention' floating/darting around a scene and other characters. Giving the viewer a chance to think and try to deduce at his speed, so to speak.

One could also use a lower/higher resolution in areas of the view to suggest where a viewer should look or to communicate the confusion of a main character about what is going on behind them.