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• Security: a normal one-way door has a frame that it sits in, with edges that hold 3 to 4 of its sides in place. A two-way door would have to forgo all of these edges, leaving the only things holding the door in place its two-way hinges and the deadbolt. And without edges on the doorframe, the deadbolt would be exposed.

  Edit: As other answers pointed out, it's true you can find doors with a top and bottom bolt that lock into the frame and floor, respectively. However I've noticed most of these are not "locking" like a deadbolt is, and the lack of edges around the door frame still means they would be exposed on both sides.

• The Elements: here we see the edges of our standard doorframe come into play again. Turns out they do more than just security, we normally put weather-stripping on them to keep out roaches and relatives and keep in things like expensive Air Conditioning and girlfriends.

• Security: a normal one-way door has a frame that it sits in, with edges that hold 3 to 4 of its sides in place. A two-way door would have to forgo all of these edges, leaving the only things holding the door in place its two-way hinges and the deadbolt. And without edges on the doorframe, the deadbolt would be exposed.

• The Elements: here we see the edges of our standard doorframe come into play again. Turns out they do more than just security, we normally put weather-stripping on them to keep out roaches and relatives and keep in things like expensive Air Conditioning and girlfriends.

• Security: a normal one-way door has a frame that it sits in, with edges that hold 3 to 4 of its sides in place. A two-way door would have to forgo all of these edges, leaving the only things holding the door in place its two-way hinges and the deadbolt. And without edges on the doorframe, the deadbolt would be exposed.

• The Elements: here we see the edges of our standard doorframe come into play again. Turns out they do more than just security, we normally put weather-stripping on them to keep out roaches and relatives and keep in things like expensive Air Conditioning and girlfriends.

• Security: a normal one-way door has a frame that it sits in, with edges that hold 3 to 4 of its sides in place. A two-way door would have to forgo all of these edges, leaving the only things holding the door in place its two-way hinges and the deadbolt. And without edges on the doorframe, the deadbolt would be exposed.

  Edit: As other answers pointed out, it's true you can find doors with a top and bottom bolt that lock into the frame and floor, respectively. However I've noticed most of these are not "locking" like a deadbolt is, and the lack of edges around the door frame still means they would be exposed on both sides.

• The Elements: here we see the edges of our standard doorframe come into play again. Turns out they do more than just security, we normally put weather-stripping on them to keep out roaches and relatives and keep in things like expensive Air Conditioning and girlfriends.

I love your question. I love how UX design makes you think of these things.

But, all of our roads and street signs are already set up for miles! Ok, well we'd have to keep using miles. And all of our thermostats use Fahrenheit! Alright, we'll keep using Fahrenheit, but only for thermostats and weather reports. But tools, parts, and screw sizes, that'll all be metric. Wait, we still have to deal with EXISTING machinery and hardware still stuck in these archaic sizes!

• Privacy: Whether it be inside a residential home for a bedroom door, or for a private office in a commercial structure, a closed door has universal significance. Although it may not yet be understood, us humans have a need and a right for personal privacy. The thing that assures us we have this is a latch that keeps the door shut and a handle that must be operated to open it.

So we cannot retrofit doors that face the outside world, or doors to private spaces (from bedrooms, to bathrooms, I think that includes almost all the doors inside a residential building. You could argue that a residential building is in total a collection of private spaces).

A great question! I love how UX design makes you think of these things.

But, all of our roads and street signs are already set up for miles! Ok, well we'd have to keep using miles. And all of our thermostats use Fahrenheit! Alright, we'll keep using Fahrenheit, but only for thermostats and weather reports. But tools, parts, and screw sizes, that'll all be metric. Wait, we still have to deal with EXISTING machinery and hardware stuck in these archaic sizes!

• Privacy: Whether it be inside a residential home for a bedroom door, or for a private office in a commercial structure, a closed door has universal significance. Although it may not yet be understood, us humans have a need and a right for personal privacy. The thing that assures us we have it is a latch that keeps the door shut and a handle that must be operated to open it.

So we cannot retrofit doors that face the outside world, or doors to private spaces (from bedrooms to bathrooms, I think that includes almost all the doors inside a residential building. You could argue that a residential building is in total a collection of private spaces).