However what is not mentioned is that "summer homes" are quite common in Sweden, usually a little cabin somewhere further out from the city that a person or family owns.
In my case my girlfriends family shares a house on the coast in Smålland, which even has functioning power and water (rare among these types of vacation homes).
I think being able to get away from the noise of the city makes city living significantly more tolerable, I nearly lost my mind when I lived in London for 4 years because anywhere remotely affordable was just loud, and you always felt like you were under someones feet.
Taking time away from the noise to get a proper uninterrupted nights rest makes a lot of sense, but I think you also need the reprieve of having personal space. Not that any city in Sweden is even remotely close to the noise levels or population density of a city like London, especially in the parts I could afford to live.
This article feels a little bit like lifestyle porn, in that very few people are actually doing this, and it sounds exotic ("just like the scandinavians!") but the reality is actually better than what's depicted and less 1-dimensional.