It boils down to how good your healers are.
30 to VIT is not required to survive any hits in any content within the game, it is just a preference that some tapped on to under the notion that for every point of VIT spent, you were getting 100% gain from it where as 1 point of STR on its own does nothing remotely special and imho, you cannot gauge 1 point of VIT vs. 1 point of STR like that especially when the way the system calculates STR is in soft caps.
It was confirmed that every 15 points, STR, DEX, INT etc all increase in power for every point spent as you hit these soft caps, however you need to find out where you are at within those values as 30 points in to STR might only net you say 20 points of useful STR while the other 10 is wasted because you cannot get enough STR to push it over.
So you might be able to put some in to STR and some in to DEX.
Check this post for more detail, http://forum.square-enix.com/ffxiv/t...zation-for-WAR. Even though it is based on Warrior, the stat soft caps will be no different for a Paladin.
According to that thread, 405 STR is a soft cap zone, you can ethier pick up or reduce to figure out where you are at from there.
Bad example imho as you are speaking from a DPS point of view and honestly, the only thing that should ever hit you as a DPS or healer on Titan is Tumult. At a certain point, if the fight lasts too long, no amount of HP or healing will save you.
