It does? I thought it worked between iPhone and iPad too, without needing a Mac at all. Is that not accurate?
It did in the betas but not in the GM... the same thing happened last year with iOS 7 and iCloud Keychain which works phone to phone or phone to iPad as well as phone/ipad to mac but the feature was taken out of the iOS 7 GM and then released across all devices simultaneously when Mavericks and iOS 7.02 came out so everybody got it at the same time.
Essentially because these functions are all shared across iOS and OS X they are protecting themselves from any remaining beta OS X issues with these components potentially breaking released iOS functionality... release it all at once for both and it _should_ all work nicely.