Is BLM truly simple?

[Sleigh]

You mean
>Move 2m to the side
>Start casting again
?

I'm just curious to see where all this "player skill" is coming from. I was under the impression that positioning was important for any class. With that said, I guess MNK would be the "most advanced" because of GL Stacks and movement?
This community needs a dictionary...

The minimizing movement aspect is actually a bit more complex than that. Most movement in the game can be handled in one of three ways:

1. Dodging at minimal loss with pre-knowledge of the dodgeable attack's timing, saving a Swiftcast/Firestarter for when you must move, moving out preemptively during a proc/Swiftcast, Aetherial Manipulation to a safe target, or moving mid-cast to keep your cast. Titan is by far the best example; with enough attention you can know exactly when he's going to do a Weight of the Land and be prepared seconds in advance.
2. Using CDs to specifically counter the attack. Manawall in Titan at scripted times, Iron Chariot in T9, Divebombs in T5 (it's not only a shield but it's a DPS increase), Manaward for tethers in T6, saving Swiftcast for key moments you will be forced to move like Ifrit EM ... etc etc
3. General douchebaggery. The gray area where you take a non-lethal hit on purpose and choose your GCD's worth over a healer's, or make someone else (or everyone!) move for you for mechanics like T6 tethers, or not stacking for Thermal in T9. Basically, things that are selfish in the name of less movement (and don't get me wrong, this can not only be effective it can be easily worthwhile raid-DPS wise). Hell, it's more DPS to camp the middle in T7 with your healers than going off to the side, but that's one of those dark areas even I won't cross.

Then there are more specific tricks, like using Aetherial Manipulation as you're sliding in Leviathan, or camping the outer edge of p1 Titan HM rocks exploding, that separate the less experienced from the experienced.

tl;dr - Due to the scripted nature of the fights you can usually do a lot more about movement than just move to the side. Sometimes it takes a lot of repetition of the fight to learn how to deal with this, and sometimes there's not really THAT much you can do to counter certain things you have to dodge, but there's usually something you can do in the long run.