I definitely do not believe your issue with the raid and effects are not specialized, nor valid. The issue you describe happens everywhere. "Cannot see individualized AoE circle because of Dancer effects. Couldn't see boss finish animation because of Holy spam."

What you should definitely consider doing is changing your effects settings as Niwashi has mentioned. And by changing as in to reduce or eliminate completely based on the radial button options available.

With the implementation of Dancer, they are currently the king/queen of effects spam and it blankets over everything else far too easily. The radius of their effects are not only huge and encompassing, but colorful and vibrant. Pretty to look at, but a huge eyesore when trying to participate in group-based content.

And that is only Dancer. Who knows how much strobe-lighting is going on at full settings with all roles acting at once.