If you have drop bars with hoods, it's a good idea to be on the hoods the majority of the time. Not sure if you ride a modern road bike but the average fitter would tell you that being on the tops the majority of the time on bars like that means that either you're a beginner or you don't fit into your bike. After all, the hoods are where the brakes are. Also, he's running single speed; safety first. Also, not tryna be a jerk but from seeing some of my bigger buddies who bike, a lot of them don't like to stretch out or go low, so I'm assuming that he is rarely on the hoods or drops (if I'm wrong, I apologize). So what's your argument as to why bullhorns would be a bad idea? I suggested it for better brake position and also since he said he likes to climb.