oh well, I think it's not that hard to find the reason, let me start with this, after the revolution they (revolutionary extremists) stopped all women's sports (plus some sports even for men like Boxing and Tennis) for a decade, only in 1990s they started with less-active sports like Shooting, they did start sports like volleyball much later, in 2000s, so this is very obvious. they started from zero.
and beside that playing with those dress codes, it's like starting the set with 8-9 pts down. those dresses make jumps harder.
i see and agree with you