I think the other issue I have with boxed rooms is that couples usually buy them as a starter house for a new family (which is fine, i understand why), but if they end up with a few kids and then in a situation where they can't or won't sell later for a bigger house etc, then there's a child literally growing up in there.
There was another thread on MN where a parent had a son and daughter in one small room (teenagers) asking for advice about layout so they could have privacy, and I'm sure they never thought they'd be in that situation and thought they'd sell and move into a larger home, but with high interest rates and being sucked into this obsession with "owning" property, a lot of people during the years of low interest rates overspent and blew their budget. There are other factors too.
I also know of a family who have a box room and their teenage daughter has it while the two sons have the second double room, and this poor girl literally does her homework in her brother's room. It's not ideal. I find it unfair on growing children... and then you have a bunch of adults (EA and sellers) trying to dress it up as a spacious bedroom. errrr naaaaah. I'd say it's immoral.
you only need to read the psychology behind why you (let alone children) need space to breathe, think, study, and also have some decent privacy
I'm not the type to blame these families though, a lot of people in our country don't have financial literacy, they don't teach us this anywhere, I just feel bad for these kids (or, young adults really!). and also, it comes down to affordability. but why aren't they affordable... because houses are over-priced!!
With Starmer's goal to build 1.5million houses in 5 years 🙄(where have we heard this before 😴) I hope they will scrap this box room design and instead create proper family homes that have the real space.