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I think it makes sense to have those in a hotel room, it'll help with more serious cleaning as well if needed. And it is needed. I've heard Stories.

Same. Every bathroom in my house has that. Though the kitchen sink does not, now that I think about it (I'm in Australia).

That’s very common in Asia where any rooms with a water source (kitchen, bathroom) also has a floor drain. Even balconies often do.

Not common at all in the US though new construction may include them in laundry rooms.

They’re actually a really smart idea and pretty much eliminates the risk of a water source leaking.

Not here in the US. It is really kind of stupid.