"Phones are often Chinese citizens' sole or main computing device, making the liking for larger screens understandable."
Visiting Hong Kong in 1993 it was a surprise to see people in the street talking on much larger mobile phones than were by then common in London. Our host explained that in Chinese culture you flaunt your desirable possessions. The state of the art small mobiles would have been too discreet.
For the same reason large Mercedes cars were clogging the local streets where a Mini would have been more efficient.