You're suggesting that the supers have identical attacks outside of the number of shots, and that's categorically untrue. Gg is instant, cross-map death. Hammers have travel time. Hammers lose super energy on every throw, and can only maximize their super in the incredibly unlikely event that they can see enemies constantly. Gg has ammo, 3-4 shots (with symbiote, currently still viable in crucible, and will receive a y2 variant), and doesn't lose energy on every use. Further, there's exactly zero chance of a gg round getting caught on the environment and blowing up early (and this being wasted), as hammers are prone to do. Have you ever so much as used HoS in pvp?