In a typical users playspace you're always near enough to the boundaries that they're visible. And speaking from experience, you do not want your VR setup within several feet of anything nice, like your television or hanging wall art, even if they're outside the boundary. As a good game of Gorn is guaranteed to make you run past that boundary and punch a nearby object.

Yes you can play some VR on a couch, but not Superhot, not Gorn, not Space Pirate Trainer. Very likely not Half Life Alyx.

I've used my VR setup from within cramped confines, but it's not something a non-enthusiast will do.

Edit: Also were forgetting a very important point mentioned above

"I'm not going to [...] lock my dogs outside just to play a video game."