I seriously hate how strong healers are in PvP. Maybe I was spoiled from Seal Rock days when I could FC a healer to death but the really need to buckle down on the balance. Healer stacking is nothing new but there needs to be a cap of two healing buffs per player. Example: if a player has regen and medica II already in effect then they cannot receive a diurnal aspected helios or even an adloquium. They also need to introduce a rock-paper-scissor mechanic, ex,

DPS deal 20% more damage to Tanks
Healers deal 20% more damage to DPS
Tanks deal 20% more damage to Healers

No damage bonus when attacking same class or class that you are strong against. I personally feel something like this would help streamline attack priority instead of just an entire party attacking a healer which is literally the only strat that most players do when they see a party with a healer.