Card potencies (class specific)

[Lilyth]

Why would you ever us TC on the AoE rotation?
That costs you TWO F2 times (one for the T1 and one for the T3 proc because GCD is still GCD).
T1+TC proc=980 potency
2xF2=1080 potency on 3 mobs.

PLUS (most importantly) it slows down your Flares. Which is the entire purpose of the AoE rotation.
That is not a net gain on any day of the week. Furthermore, clicking off a buff is a pain in the butt on the PS4.

A GCD is a GCD?
While two fire IIs take 6 seconds to cast (not taking into acount SS), a Thunder plus a TC proc only takes 5. And even then you're ignoring the possibility of another TC proc'ing for another 745.5 potency which is highly likely to happen with 2 mobs having Thunder (this is particularly fun to do when a known tank is still moving forward pulling mobs so you can keep moving with him and casting TC procs instead of scathes). I find 100 potency on an AoE pull is worth sacrificing for a chance of having a higher DPS, but that's just me.

Also you're not really losing any flares. You should always end the AoE pull with a Flare regardless of your MP so you'd only realistically lose a Flare if you delayed the rotation for around 10 or more seconds. And Fire II is only really a filler used until transpose comes off CD. You can easily swap a Fire II for a TC proc and still gain DPS (on 3 targets) while not delaying your rotation.