Titan-egi, which is for some reason underrated by some, literally has a stonewall you can refresh back to back that will absorb like 2-3 hits from an enemy that's like 6 hits you're invunerable for no other dps has that kind of defense. Enemy should be dead by that time. SMN does enough damage on it's own and has ridiculous AoE capabilities without garuda/ifrit solo. Not like titan doesn't have his own execute and aoe damage as well. Doing solo content ifrit/garuda don't really matter since you will be doing more than enough damage. With just titan-egi out you will still outdamage a solo rdm or mch