ivocaliban
Explorer
Oh sure, the barbarian might be superficially scarier. But it isn't about scariness. It is about getting what you want.
And what about the demoralize opponent portion of Intimidation? The result of which, if successful, leaves an oppoent shaken. It sure seems like there's some scariness involved here. Granted it's still about getting what you want...you want your opponent to be afraid.
I'm not arguing that Intimidation can't come about through Charisma, of course it can. However, it doesn't take into account the innate intimidating factor of big scary people/things. I agree that lawyers can be among the most intimidating people on the planet, but so can big dumb walls of muscle who just stand there and "look" intimidating.