Average BLM DPS T8?

[HaroldSaxon]

Try this one out: Lets say u have 0,1 sec less cast time on fire then i have, that means u need a few casts to actually get ahead of me.

we both start with the same rotation. if we both get the interrrupt at the same time, lets say in 2nd fire rotation, ur mid way tho cast fire and im at the start of casting it, then ur ss bonus wasnt enough to gave u +1 fire cast compared to me.
that means we both had the same amount of spells, but my spells where hitting harder cause of the extra INT and we start again and ur bonus of beeing half a spell ahead is gone .

if u get that bonus form ss all the fight long and that means u can cast without getting interrupted, u can say its the strongest stat for BLM.

1) If you have to cancel a cast running Spellspeed, you WILL have to cancel for Crit/Det. This means that any bonus that was achieved by spellspeed is still achieved because you are still ahead.

2) There are many times when you cast a spell with spellspeed where you do not need to interupt your cast and you can move after (or use cast clipping to move). With a crit/det heavy build, there are instances where you can't finish your cast.

2) When you do cancel, you have a longer time recasting with crit/det compared to spellspeed. Another instant advantage.

3) If a fight has a short break (Such as T9 megaflare, T6 Blight, T5 Divebombs, T5 Post Snakes/Pre Twisters, Levi Jumps, Titan Jumps, Ifrit Jumps, Garuda Jumps/untargetable), then it doesn't matter what build you are running, you are at 0 dps. Does this make spellspeed builds terrible in these fights? No, because you aren't dps'ing and it doesn't count towards your dps. The break makes no difference.

You're assuming best case scenario for a black mage with that:
2 scholars who perfectly weave fey glow for you for 100% up time (practically impossible and chances are you only have 1 scholar anyway)
All Scholars use Selene - Even with 1 scholar, Fey Glow only has 50% uptime MAX. In reality this is much lower as there's always a few seconds lost on it (be it on sic or obey)
With the above, depending on the scholar and encounter, Eos might be used instead. As result you'll have no buff up at all from the Scholar.

Unless all conditions mentioned above are met (2 scholars, perfect fairy coordination, no pet derping and they don't use the skill speed buff at all), I believe it's wrong to use the higher value.

No, the weighting is for 1 scholar with 50% uptime of Fey Glow. End game scholars that are decent use scholar. Theorycrafting like this is designated for end game. Things like T8. Things like this thread.