Being a Police Officer myself I know a thing or two about bar room brawls. You can use restraints to subdue an unruly person, maybe a noisy drunk. But I have never seen one used against a guy who is already fighting.
Watch how those morons figt on the Jerry Springer show. They're untutored idiots who have never trained. But that is one of their best weapons. They grab your clothes, hair, face - and they scratch and bite. They come at you like ferocious animals, and the idea of trying to catch a wrist of a person who is striking you with every other part of their body also is unreal.
But I have nothing against Martial Arts being "deeper" and philosophical. But their practitioners should not claim fighting skills beyond reality.
Anyway, I don't like my brother in law.........but thats another story!