I started playing not long ago and played NIN through the entire ARR as soon as I got the job, and intend to keeping it my main. But I think NIN has spoiled me so much in terms of the quick actions and instant button response, with that I find casters horribly annoying to play.
So far I've tried Astrologian (aka the s tier healer), the damage output seems unforgivingly low in low levels. I've also tried Arcanist (lv 29) but I'm hesitant to play it anymore further because of the slow casting. I would only imagine Blackmage's gameplay would be even slower. I don't know how to adjust myself to play casters. It's really frustrating especially in group settings when mobs die to someone before you even finish casting. It feels very unrewarding and slow. How should I approach caster job?