Swift, definition of version 1.0 and ABI stability

I don't have any opinions on Swift itself, just their versioning. Why would you release 1.0 without a stable ABI? We just had a choice of Swift or Obj-C in our project and Obj-C won by a landslide because its stable. Swift just seems like a toy language that Apple screwed up a long time ago by releasing it way too early. It is basically useless if you need to do anything else than source based integration. I am baffled and confused.