I love my polish. They've always been my favourite breed. Out of our horrid hatch last month, the polish had the highest hatch rate out out of all the other breeds. Shipped. Competing against fertile eggs from twenty feet away. I wouldn't call that fragile, exactly..
The chicks are kinda iffy, but I've only lost one in my history, which had issues since hatch. The most problem I've had is poop butt. Basically, whenever the chick seems a bit "off", take it out, give it some electrolyte water (NOT sugar water. Electrolytes.), let it rest, and it'll be good. Beware, though, they're really small, so they do good with themselves/other bantams/other small breeds. Mine tend to do fine with big chicks that they hatched with for the first week or two, then the size difference gets huge and they need to get seperated if you have especially aggressive or big chicks (wyandottes and leghorn crosses). Currently, we have my brooder chicks in with campines and cubalayas, both of which are light chickens. The wyandottes and leghorn crosses that are even younger than them were just too big and pushy.
Maybe it depends what stock you have, but mine are also rather friendly. Our one WC blue polish will jump out of the brooder and fly onto your back. She sits on your shoulder like a parrot. I love her.
It might just be the way you raise them..? We pick them up when they're young no matter how much they fuss, and feed them out of our hands as much as possible.
Anyways.. To the question.. I'd say that it's just hard to find pullets. On ideal, they still have most polish varieties available, straight run. Dunno if you have small chicken area, but why not order 11 then get rid of the roos? It says you can even get them next week.. Even the WC Black and WC Blues.
