How much DPS does Selene actually add?

[Lemuria]

Smart BLMs will try for as much Spell Speed as possible, and also SSPD has a value of 0.270 for BLMs. Which make the Selene numbers even better for us.

I never saw much point in spell speed. Presence of Mind on WHM literally doubles your existing spell speed and only makes a small difference to cast times overall (roughly 15% bonus on around 460 spell speed), so these small increments given by Selene probably won't do much in practical terms.

The main issue is that all this DPS checking implies that you're able to endlessly chain strong attacks, something BLM cannot do because of Umbral/Astral and SMN can't do since most of their damage comes from DoT, and not from Ruin. It's probably great for melee, who are likely to see the strongest benefit from Selene since they are only limited by GCD in most cases.