They aren't going to change it for two reasons (and for once their reasoning is legit):
1.Time of life after super is activated for a titan sunbreaker is on average less than that of both striker and defender variants, making its survivability and therefore value to the individual Player is less.
2: It is possible to survive a hammer strike, with appropriate armor elemental defense and/or overshields equipped and so does not guarantee a one hit kill. Titans should be tanks. They should be made to charge enemy lines and destroy anything in sight. Just as much as hunters should be made to be sneaky gunslingers. Just as much as warlocks should be able to provide mass firepower from a distance. Those are the roles. Stop trying to deny the roles each of these classes is SUPPOSED to fill.
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Then why does the Titan need a ranged super with health regen and massive armor? A Titan does not need a ranged attack in a super that has so much armor that it takes 4 or 5 shotgun blasts.
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If any change should/would be made it would be that cauterize doesn't restore both health and shields simoultaneously.