Let's get something straight first. I don't think Titan is too hard, in itself. Many, many, many players have already succeeded in besting the earth Primal. However, here is what I wish to discuss, as well as see if possible solutions can be offered, heard, and replied to, by SE's officials, even with a vague "we are looking into it" answer.
Through the Duty Finder, Titan gives you two tanks.
Most groups I have seen require three healers, one tank, and four damage dealers to down Titan. More geared groups, i.e. people who already have their Relics, choose to do it with one tank, two healers and five damage dealers, and this is fine too. Thing is, the groups are usually very SPECIFIC in build, and the Duty Finder can't handle this. For example: you NEED, ideally, a White Mage AND a Scholar, or two White Mages, but you can't do it with two Scholars. Similarily you need a Monk or Dragoon for their Limit Break, although that's more likely to be respected by the Duty Finder than anything else.
But an appropriatedly geared group, without anyone being overgeared (or undergeared), simply can't do it with a surplus tank, especially if all other conditions (WHM healer + at least one melee DPS + not more than two melee DPS). Either the damage will be too low, the healing will be too low, or it'll be a combination of both.
What I'd like to know is why a fight that was evidently not tuned to have two tanks in the group, makes you have to have two tanks through the Duty Finder.
I'd also like to know why the fight can't be retuned to require two tanks, that way tanks don't have such a hard time finding a group to get their Relic.
I'm not saying that Titan should be defeated through a group of complete strangers without much organization or knowledge, such as the Duty Finder usually gets you stuck with, but I AM saying it would be nice, at least, if the Duty Finder gave you a CHANCE to down him if your group is decent and willing to learn the fight. This could be done either through making the fight easier to account for a second tank, or through making it much easier, but adding a whole new mechanic that requires a second tank. Maybe tank-swapping? I don't know. But anything at this point would be better than leaving it as-is.
But overall? I'm fine with the overall difficulty the fight presents right now, but I think that difficulty should INCLUDE having two tanks, as opposed to being difficult ON TOP of being stuck with a second tank who won't be able to do anything but sub-par damage the whole fight. And to me the best way to do this would, IMO, be to:
Make Titan's abilities overall hit for less damage, notably Bombs and Weight of the Land.
In rebound, make Mountain Buster apply a stacking defense debuff that expires in 45 seconds. At two stacks it would be lethal to keep trying to tank Titan, and so the second tank has to pick him up until the debuff clears on the first, and it rotates like this for the rest of the fight.