The lack of rear wiper is standart for most sedans.
I haven't noticed that until I tried to turn on the rear wiper in a car of a friend. Now all I can see on the road is the lack of wipers on sedans. Keep checking for wipers all the time, like an obsession and most sedans don't have it. It's probably not super dangerous, the sedan's shape allows for the airflow to flow along and clean it.
Sedans have a sloped rear window. In theory, laminar airflow is sufficient to clear any debris from it.
SUV/CUV have a nearly vertical rear window. This creates a pocket vortex where dust and water stick to the glass and there is no airflow to blow it off. And the Ioniq 5 is considered a CUV.
I haven't noticed that until I tried to turn on the rear wiper in a car of a friend. Now all I can see on the road is the lack of wipers on sedans. Keep checking for wipers all the time, like an obsession and most sedans don't have it. It's probably not super dangerous, the sedan's shape allows for the airflow to flow along and clean it.