Black magic...kinda sucks

[Rongway]

True mobility is being able to move AS NEEDED WHEN NEEDED

BLM can move when needed. If you can't move when you need to, you're doing it wrong.

Aetherial Manipulation lets you teleport to a friend every ten seconds. Between The Lines lets you teleport back to your Ley Lines whenever you want. Thundercloud and Firestarter reduce your cast times to 0s and can be forced to proc. Between Sharpcast, Swiftcast, and Triplecast, you are guaranteed five instant spells per minute. This adds up to about 20% of your time in combat. It's your responsibility to make sure that this 20% of combat lines up with the times you need to move.

If you don't want this responsibility, play a different job.