> Denmark loves their 'wet' bathrooms in hotels, no shower door and a drain in the center of the room.

If you're renting an apartment in Shanghai, a cheap one will have a door to the bathroom, but the shower won't be a separate fixture. The entire bathroom functions as the shower (the hose or fixed piping is mounted on a wall), and there's a drain in the floor.

A more recent apartment will have a shower installation that is, say, separate from the toilet.

Higher end apartments will. Even newer apartments in Beijing will have wet rooms at some price point. Remember that the apartments are built in China unrenovated, and even new owners of second-hand properties are expected to redo everything from a concrete box, so it is 100% up to the landlord/owner on how the bathroom is done, and I’ve seen it done many many different ways.

This is standard in all of southeast Asia and often the middle east.