I count my blessings every day that I have a DS as well as 3DDs.
If you had a massive set of balancing scales, and you put my DS on one side and 3 DDs on the other..it would balance!
Not in terms of weight/size obviously, but in terms of personality, and them all bringing out the best in each other.
I'd be grateful for any combination of children, but I do think having a brother makes my girls a bit more confident and less phased by things, and gives them an insight into how boys are - all good life skills!
It might be a coincidence, and perhaps also because I've never encouraged the pink, frilly, princess, looking immaculate thing like some mothers of girls do, but my girls are just not that girly. They climb, get dirty and are full of adventure, just like their brother, which is how it should be.
My youngest likes a swishy pink dress along with the best of them...but she'll be doing skids on her bike while she wears it! I think their brother's adventurous spirit has rubbed off on them, but maybe they would be like that anyway..who knows?
They don't look at boys as nuisances, or vile, or too loud, or aliens like I did growing up! It's a shame that your friend does, OP. Her daughters will likely grow up with the same ideas.
My DS benefits hugely from having three sisters, too, although up until recently, he would have swapped the youngest for a brother..and on a bad day..
!