You have the choice to open the door if you wish. This choice has been removed from those who prefer privacy if the door doesn't exist.

From your link:

Making Privacy Work

Make sure to address the elephant in the room - privacy. Consider installing electrochromic glass panels that switch from clear to opaque. Or take inspiration from Japanese architecture with sliding wooden screens that double as art pieces.

Your sample link's examples seem conspicuously toilet-free to me.

But even without talking about toilets, I don't like airy/drafty feelings when I'm wet, so I'd hate most of those designs, myself.

I love pooping and having my dog visit. A little someone to talk to rather than scroll.

apparently not having doors prevents hemorrhoids.

So you can take a dump with some privacy, obviously.

There must be two types of people/couples.

Those that prefer privacy and those that don't care.

A door has two states to choose from, so having a door covers all use cases.

I would be surprised if private defecation is not a majority preference among couples.

Even if I'm alone in a hotel room, I'd prefer to contain the odor to the bathroom.

And a third type, people who have had children so have gone through the toddler stage where a toddler would literally chainsaw and burn down a locked door before they let you have 3 seconds of peace to take a shit.

That's actually a very valid point I hadn't taken into consideration.

If you're single or have a partner that you're comfortable with, open concept bathrooms feel luxurious. But if you need sanctity and salvation from the kids, I can get it.

The real issue is when they're old enough to reach the lock, but not old enough to trust not to destroy things or injure themselves if left unsupervised.

We tend to not care for showering/peeing, but pooping is something else...

I’ve actually ended otherwise decent relationships early because the other person was way too coy/upset with bodily functions like farting and pooping. If we’er sleeping together I expect us to be farting together. And if we are living together I expect us to be using the toilet in front of each other. Anything less is both inconvenient and reflective of deep personality conflicts that will never be resolved.

Sounds like there's going to be someone around who's bound to be the source of deep personality conflicts all right.

I have never in my life imagined that someone might break up with another person for the sole reason that the person refused to poop in front of them. That is honestly wild to me, but I appreciate your perspective, thanks for sharing.

Been married twenty years and haven't seen my wife poop yet. Not really on my list.

Similarly, married ten years and my wife and I have never seen each other use the bathroom. And barring dire emergencies I can't actually envision, we never will.

It's stories like these (and poor parenting I guess) that causes things like my cousin standing up to wipe for close to 30 years until his gf filled him in one day.

My college roommate told me I was doing it wrong by not standing up to wipe. I just rolled my eyes, that guy had a lot of weird things going on.

I don't want a room to smell literally like shit.

You live alone?

No. I think some couples are just more private than others.

I don't think there are any couples who prefer the bedroom to smell like the toilet.

If you flush the toilet at precisely the moment after you take a shit, the vacuum force of the toilet venting down the waste line will pretty much keep that from happening. That's basically prison rules.

Where is this magical prison where nobody farts?

They flush the toilet every time they fart, of course.

That is called a courtesy flush and it does happen.