I've seen that in several buildings in Dubai. Considering that most of Dubai was built since around 2000, these kinds of advanced elevator controllers should've

I've seen that in several buildings in Dubai. Considering that most of Dubai was built since around 2000, these kinds of advanced elevator controllers should've been available when at least some of these buildings were planned and built. So no, probably not legacy. Maybe those hall-floor-selector systems are simply much more expensive. Or maybe they only make sense when you need a really high throughput.