

It’s the case for all dishwashers I know about. It’s not that weird if you think about it. When people wash dishes by hand, they often wash a bunch of dishes in the same basin, with the water becoming increasingly dirty. Depending on how dirty and how much they care, they’ll change the water occasionally. Then they’ll give everything a rinse in clean water to get rid of soap. (obvs people do dishes on a variety of ways, but this is pretty common in western cultures.)
Dishwashers are the same, spray the same hot soapy water over the dishes for a while, until it’s dirty and most of the solids have been removed. Then drain and wash again with clean water. The soapy stage is about removing dirt, but the sanitising comes afterwards with the hot rinse and drying.




There’s lots of architectural guidance, building codes, etc. normally linked to number of people in the household. But it’s all pretty damn relative, both culturally and individually.
When I lived in the city, I was pretty comfortable with a small appartment, because I spent a lot of time out of my home in cultural spaces. Now I live in the country, and in city-terms our house is gigantic for just the two of us. Netherthless, we’re continuing to convert old out buildings into more space because the demands on our home are much higher and we have lots of unused space.
Not only do we live there, but we’ve got jobs that involve a lot of remote working, and it’s also a building site/workshop as we renovate and make our own fixtures and furniture. Plus, because it’s more remote, we want guest bedrooms and extra space so that guests can come and stay for a while without feeling cramped. Then we’ve got animals, who bring their own clutter, and we also want to create a guesthouse that we can rent to tourists. Even without those extra requirements, we choose to sleep in adjacent, but seperate, bedrooms because we have sleep issues. And I know that is a crazy luxury that we wouldn’t have been able to afford in the city, but when space is cheap, there’s no real reason not to.
I know that my example is pretty extreme, but everyone’s needs are different. I have friends who basically live in one room and love that, because everything is within easy reach and they don’t want to have guests. But I know it would be depressing and claustrophobic for others. Sharing an apartment with four adult strangers is a different experience from a family home with four children.
I think there can be rules (you can’t claim something is a bedroom if it’s smaller than 6sqm) but there isn’t a one size fits all solution.