But then it wouldn't be Flash would it?
Flash is a traditional spell throughout the FF series whose sole purpose is simply to blind the enemy (in other words, it's a debuff spell, nothing more). Be thankful it's an enmity builder! It saddens me that there are so many so-called 'Paladins' here who are more interested in causing bloodshed than actually trying to protect their party members, all because their 'damage numbers' aren't as high as someone else.
Really, you want to do damage? Be a DPS. If you're a tank, then you should be
tanking. If you're a PLD, your gimmick is high damage mitigation/debuffs and abilities that specialize at single targets. It's as simple as that.