Is it common to put where you defecate in the same room as where you clean? I've seen many "half baths" which are just toilets and sinks, but bathrooms that als

Is it common to put where you defecate in the same room as where you clean? I've seen many "half baths" which are just toilets and sinks, but bathrooms that also contain toilets not even separated by a door. If it's about space utility, then dividing the rooms in two allows twice as many occupants, unless it's customary for people not to wait to use the toilet until others are out of the shower.