It's an interesting read. Currently PG, I don't mind either way right now, as long as I am able to carry a baby to full term, would be great.
As for the genders, a friend has one of each. DD first, DS second. DS is far more sensitive and placid than DD. Mum often comments and says yes I got one of both but the other way around ITMS. DD is energetic, loves reptiles, mud and riding her bike. DS loves kittens, playing on his scooter outside but hates getting dirty or falling off.

You never know what you're going to get!! Even when you get it.

Dear Friend, is more fearful for DD, as being a girl she will require more grooming as she grows, ie appropriate behavior, dressing and general protection skills (she is tall pretty faced blonde blue eyes) As for DS his appearance as he grows will help protect him (he's a solid stocky kid)

As far a selection, personally I agree with it for a medical reason.
But also in a modern world, Australia for one, is growing up with new cultures that have a reason for there belief systems, but being in Australia, allows the notion of weaker sexes to change for their cultures. Some cultures, if no restriction to the number of children, they have a preference for which sex comes first. A boy would help the family by working and providing, a girl by cooking, sewing and looking after the parents.
And in other culture, the notion of having a girl is changing dramatically, so much so it's feared in that country there will be a shift in the future leading to problems later.
I guess I'm trying to say is being that Australia is growing and changing, it will adapt.