I was always a bit more talkative than average, so that's not what it is.
Duty Roulette is forcing me to adapt as a white mage. I'm a coward so I would wait until someone in my FC was free - preferably our mack truck tank (friend I've had since high school, to boot) - or at least someone who could explain how the fight went over vent or FC chat ahead of time.
Since I started doing DR, I don't get that luxury. I get tossed into fights and dungeons I swore I'd never do again. I was thrown into an Ifrit fight last night, and we won on the second try (DPS didn't go after the nail fast enough the first time. They learned fast.)
I think this - the repetition of dungeons - is exactly what SE intended us to do. In other games like XI, you learned to play your role in the game in exp parties. In XIV, it's all guildhests and dungeons.
TL;DR - Practice makes perfect, and playing with other people improves that perfection.