The only other class that doesn't have it is defender Titan which makes sense because they have a shield which is damage resistance. Sunbreakers are basically a golden gun with 5-7 shots that have explosive rounds and they get so much damage resistance that it takes 2 golden gun shots to kill them so why does gunslinger not get damage resistance in super?
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Sunbreakers hammers move many times slower than a golden gun round, making them more of a skillshot super more than anything. Golden gun can OHK most people at extreme ranges. What I'm trying to say is GG has a faster TTK than hammers, so if they made GG harder to kill, it would almost be imposible to kill a person in GG before they kill you