It was an inevitable change imo. In nearly any competitive PVP team-based situation, a move like Flare, (highest DMG potential AoE with no target limits) being able to be cast twice in a row would be dreadfully OP. That said, Flare is still the highest damaging AoE attack in the game, and it can still be cast twice, making it still the best candidate for swiftcast AoE DPS. And BLM did get a 10% damage increase as well.