Knowing when to switch your main class?

[Akiza]

This is a very good point.

BLM appears from the outside to be a faceroll class that inflicts respectable damage with a simple rotation, has infinite resources, and has only one glaring weakness (movement).

In practice, the complexity of BLM play is not nearly so much in the buttons you press as in your own judgment, planning, sense of timing, and even "twitch" ability. Movement alone is rarely that big of a deal when you cast-clip, use defensive cooldowns, and AM properly.

The difference in DPS between a good BLM and an average BLM is HUGE even though they could both be doing basically the same rotation.

The difference in DPS between an average SMN and a good SMN is a insurmountable gulf