But, here is the thing . . . if a sequence is getting too difficult during tech, you might need to cry foul.
I was in the middle of tech of Richard III, and we were getting to the battle sequence. Huge walls parting, sword battles, lights, sound effects, in the middle of the sequence, Richard had to get his harness tightened, so that he could get hooked up to a Fly Line, and then have ropes tied to his arms and legs and be "drawn and quartered" on stage. 90 minutes into tech, it was obvious that the tech elements were becoming OVERLY complicated, and I would not be able to focus my attention on the people . . . so, I had to have a little pow-wow and we ended up not making anything simpler, but actually midi-connecting lights and sounds . . . so I called fewer cues, got the complicate sequence the designers and directors wants, and I felt confident I could watch what I needed to watch (as well as two deck Stage Managers who could keep and eye on the things I couldn't see.)
Remember, if there are things we have to watch (either for safety purposes or to maintain the show artistically) - we sort of need to figure out how we are going to do it during tech and NOT let the sequences get out of control.