Spellcasting in PvP

[Dimitrii]

This is true of every dps in frontlines. The difference is, all you have to do is poke a blm and they do almost no damage to you. Other dps have off GCD attacks.

No this is not true of every dps in frontlines. While it is true that all the dps may be able to burst a target down occasionally, that burst damage potential is still restricted by the recast times attached to the abilities the dps would use to perform said burst (i.e drg's jumps + pvp abilities, smn's enkindle, monk's howling fist + pvp abilities + steel peak, etc). Black mage would literally be the sole exception to this limitation as their burst comes from spells which are on the gcd (firestarter procs from using fire, thundercloud procs from using thunder and flare).