What's the last thing a client asked you to change that you secretly agreed with?

I'm in the weeds on a textbook figure where the surgeon wants more red in an artery that's already aggressively red, and I keep going back and forth on whether I'm just being stubborn about anatomical accuracy. It made me wonder if other people have that moment where the client's 'wrong' suggestion is actually kind of right and you just didn't want to admit it.