Titan issues that need addressing.

[Gyson]

If you're not paying attention to cast bars then how did you get past bosses like Coincounter and Chimera who's major attacks have no AOE indicators, and how do you expect to deal with mechanics in Coil many of which also have no AOE indicators. Paying attention to cast bars is a required skill to succeed in this game.

While, as the tank, I may be taking care of Dragon's Voice and Ram's Voice on Chimera, you can be certain there are many players on those runs who aren't even aware of these mechanics, and yet get through the trial successfully because someone else (e.g. the tank) was taking care of it. Point being, that the average player may not be paying attention to cast bars is really of no surprise to me.

Also, it's the tanks job to stun bosses. Good DPS will hold off on using stuns during most boss fights so they won't build up immunity.

I disagree, and I don't think it's the tank's job exclusively. While you certainly don't want DPS firing stuns off at random and making it impossible to (example) interrupt Ifrit's eruptions, a well timed interrupt from DPS is both helpful and welcome. Using your Chimera example again (an encounter which I farmed over a 100 times), many a time my silence has been on cooldown when Ram's Voice popped up, only for a helpful Bard to save the day with a well timed and intentional Blunt Shot. I think in a perfect world the entire party should be using all of their abilities to the fullest (and intelligently) to guarantee success.

But, we're getting off track.