Suggesting a "dark mode".
Hear me out, because I'm not asking for a full revamp of the game UI :)
I usually play at night before sleep. The white flashing effect for every rage power is blinding. Even with my AMOLED screen at near minimum brightness and with a night time filter that removes a fair amount of blue. I end up closing my eyes (and still seeing the effect through my eyelids) and waiting for the animation flash to finish.
What I propose is a toggle in settings. Call it whatever. If active the fade-to-white portion of the animation would either be skipped or fade to black instead.