Frantically hides his xenoporn in case someone TPs over to his place.
Actually, there is a very good case for making a zone that no one outside can see in or hear what’s going on in it. However, I also figure there needs to be a bit more fine tuned control over the details of that restriction. For instance, you want a zone where no one can see in, but where those inside can see OUT without trouble.
Contrariwise, you might want a zone where no one inside it can see out, but everyone outside can see in. Say, an arena zone where you don’t want the contestants to see the audience, but clearly want the audience to see the contestants battling it out, and cheering them on.
You’d also want to be able to separately determine whether sound can get in or out. Perhaps while also being able to set the volume lower for sound that’s coming in from the outside. Say, muffle the traffic noise from outside the apartment, while also making the sound inside the apartment largely inaudible to anyone outside, or even completely inaudible.