A) Ben is a mediocre at best actor who luckily is good looking enough to slide by without ever having to stretch himself further than "guy from Boston". Also, there's nothing about him that screams "tough" unlike the actual Frank Miller Batman they're trying to go for here B) Batman is one of the most brilliant minds in the DC universe so him running into a debris cloud from a falling building without his gear is a little too impulsive. You don't run head first into someplace you can't breathe or see. You can't save people like that. C) Batman is already close to 50 and we're finally putting him a canon DC cinematic universe? Not much foresight there.