The reason is they are 2 completely different playstyles the titan is the middle man your either a warlock (far right) , a hunter (far left) or a titan ( the middle balance)
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Actually the titan would be the "tank" class the warlock is technically the middle class. Hunter has the lowest armour and is the fastest warlock is the middle and the titan is a tank lol
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You are going of armor not base abilities and stats