When I was initially doing the normal mode, the usual orange AOE indicators were already quite difficult to see in the orange field. During the fight, light effects can change how vivid the field itself is.

In Savage, it can be very hard to tell what number one receives in the Brightened Fire mechanic. The number is glowing white. There is also another icon, a glowing white diamond, above the number. Both the number and the diamond have some little subtly colored sparkles inside them. Yes, with enough practice, everyone could learn to distinguish these. But it is a remarkable contrived hindrance that borders on being difficult to look at (maybe I'm just getting old, but it's a thing). The numbers pulsate in and out for the seconds that they appear ... while the circles marking the scope of the Brightened Fire AOEs also pulsate.

I get that it's fancy. But it is too much.