Because the macros suck. If you’re trying to hit certain protein / carb / fat ratios, eating more of the “protein” means eating a lot more carbs and fat too, which often isn’t the goal.
Your analogy is not accurate, it would be more like waking up in pain in the middle of the night after a bad injury, and taking t3s with codeine+ caffeine, and wanting more codeine without wanting the added caffeine.