Earlier quoted context omitted.
"It’s not uncommon for a guy to gain 4 pounds of what looks like muscle when they go from a low to a high carb diet. This is probably the main reason high carb diets are so popular among bodybuilders" from the article. The main reason for high carb diets is the energy to lift more. It is not for a brief pump. (among bodybuilders)
> The main reason for high carb diets is the energy to lift more. Body builders are physique athletes motivated by aesthetics. Assuming body builders do indeed prefer high carb diets, we currently have two hypotheses here: 1. They've tracked their energy levels and the data convinced them that high carb diets improved their energy levels in the gym, which ultimately improves muscle growth over the long-term (your hyp…
They used to be, but now the majority of competitions have actually moved towards sheer size. Arnold Schwarzenegger, among others, is a vocal critic of this so they actually created a new division called “Classic Physique” to address the problem which is now purely dedicated to aesthetics and proportion.