For exemple the 3rd bone breaker at the arm, is word for word shiho-nage irimi-omote. And it is to be used as the name aptly says, to break the arm of your opponent.
Well, the waza may indeed be designed to break someone's arm at some level, but let's look at this a bit. Do you know anyone who has broken someone's arm with that technique? Have you yourself ever done it? Have you ever applied sucsessfully to a fully resistant, in shape, trained opponant even a "safe" version of the technique?
Not to be a spoil sport...but it can be really hard to take a strong, fit, aggressive person and put their hand behind their shoulder.
Ron (and no, I'm not saying that aikido doesn't work)