A lot of Asian homes don’t have a dedicated shower stall, as building spaces tend to be very limited.
Wet rooms are pretty common in Korea, and probably a lot of dense cities. The whole bathroom is treated as the shower, and there’s a drain in the center of the room.
Not saying I like it, but it’s not like this is some landlord special.
One of my old coworkers had an issue with that when he was visiting the US. He was at his hotel room and he did not put the shower curtain on the inside of the tub and basically did not even use it and went about showering all willy nilly. He finished up and there was a bunch of water on the floor and he kind of just assumed the drain was slow. The other person staying in the room from the US went into the bathroom and wondered why the fuck the shower curtain was on the outside of the tub. My coworker was from India and just thought the curtain was there to cover you if someone wanted to take a leak.
Cultural differences. Like the Korean ones, Indian bathrooms are generally designed to drain water from the whole floor, but instead of the center, the floor usually slopes down slightly to drain in a corner.
In the ones that do have a wet area - like in higher end hotels, there's usually a glass door as a separator.
I actually do like that feature. Thinking of doing it at my house. Would make cleaning so much easier. Get the removable shower head, spray everything down and just squeegie it to the drain.