How come I don't have any problems dodging Eruptions and Plumes (Ifrit's), even when done in the last instant, but still get hit sometimes by a silly line attack like Desolation or slow-as-molasses the Ram's Keeper?

When I get hit by Plume, I can't even see my character, I'm inside the flames (sometimes I even think I'll get hit but don't, because I got used to dying while out of things). Then comes silly Landslide and sends me off the arena when I'm out of the line before the cast ends (I see Titan turning, and I get ready to run if it comes at my direction, so it's not a "last instant move")...

I think there's more to that than a mere delay. It seems like some area attacks/red circles are horribly programmed. Either that or my inner white knight refuses to acknowledge that this is never going away.