And as when it comes to beating your wife, I think
this guy nailed it.
And no I don't think it's a futile exercise NOTHING in the Quran is futile, it's a last resort when IMHO
all communication fails on the woman's sidde, and you know between you and God that she won't listen to you otherwise when she is truly doing the wrong thing under religious ruling!
The man in the video says that some scientists even advocated that instead of using something as small as a meswak/toothbrush a man can poke the woman with his fist. It's dead obvious that the purpose is not to inflict physical damage but it's to get the attention of the woman to the magnitude of her mistake.
Even in our western societies like here in the states, a man just can't be arrested for lightly poking his wife with his fist! If it doesn't inflict significant pain, bruise or cause any type of injury then it doesn't really fit the legal definition of violence.
KEEP IN MIND every Muslim's top example is prophet Mohammad (PBUH) and in no historical reference that I have come across does Mohammad (PBUH) advocate nor implements wife beating.