Why didn't we do several instances like before?

[Mimilu]

Just put some walls into the room

They do have craftable walls that you can put in yourself... >w>

[Niwashi]

Like a real apartment no a studio probably. Division with a space for the kitchen, bedroom, living room, bathroom

It was clearer in Japanese. There they're called mansions, which is the Japanese term for a small one-room apartment. (It's a loan word from English of course, but based off an advertising use of the word discussing efficiency apartments as being "one room mansions".)