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It's very common (maybe even code?) in commercial bathrooms in the US as well.

Not sure if the residential code is lagging, or if it's just not a popular design here.

No floor drains are required in commercial ICC code, but they're a really good idea.

Where I am in Aus, you can either have floor drains (with a specified fall in the floor) or each basin/bath has to have built-in overflow prevention.