I completely understand what you mean. I don't really feel like boss fights are a power struggle between us and them, but almost more of a stage play or something. That's kind of why I want to see more chaotic elements at play. Rather than the boss standing around doing nothing while casting an upcoming mechanic, I want to see a return of more layered, smaller mechanics. One mechanic starts, and two more start before the first has finished. Like orbs popping, adds that explode, random party members getting hit with small AOEs, random line AOEs firing through the arena, and any one of these mechanics doesn't necessarily need to hit all that hard if failed, so getting clipped by things doesn't feel like a failure, but a part of the chaos.