Is there really a need to use Flash constantly?

[Alistaire]

You always want to consider how many mobs you have.
If you're pulling three, I generally stick with the Shield Lob (for my main focus target), Flash Twice, then Rage of Halone combo.

After my combo is done, I'll cycle through to see the enmity of what's around me. Generally speaking, I'll do another flash, then switch to mob #2 and do RoH combo on that.

However, if I'm doing something like a Brayflox speed run, I'm pretty much going to flash the whole time. Between the madness of the AoEs on the floor, and the shear number of mobs, I'll just get centralized and spam it. Near the end when I know I have some room to breathe, I'll get some Riot Blade in there to minimize downtime from MP regen.

Also the more mobs you have the less your dps matters since you don't really aoe much on pld.