Protein on a cut, carbs on a bulk. What roles do these two play?

I read in another post that on a cut, protein is the most important macro and on a bulk, carbs are the most important. I know a good diet is more than protein and carbs but why are these two regarded as some of the most important? I'm assuming protein on a cut is to retain as much muscle mass as possible given you're at a caloric deficit but what about carbs on a bulk? Aren't they mostly just energy?

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