Those recessed roofs usually will either eventually leak or turn into wadding pools.
In Kuwait every house has a flat roof with a high parapet around them they are used as we would our back yards here in the USA. Some having rather large trees planted in extremely large pots. in 2004 one day it rained nearly twice the normal yearly rainfall in a few hours, this was after a summer of stronger than usual dust storms lots of blocked drains. Some houses had water standing as much a half a meter deep on their roofs. That's a lot of weight even for a reinforced concrete roof