Could that be because the majority of the audiences don't want something new, they want something they have seen before (and therefore can understand because someone has explained the plot to 'em!)
But I personally like the gun toting kind of character that brings an arsenol...makes a lot more sense rather than trying to reload with presumably sweaty fingers and typically in scenes with bullets zinging past the ear, in the grey-dark lighting... and is more likely to convince me. I find myself counting shots just because I know Hollywood thinks no one knows how much bullets a clip can hold.