I agree with you overall, but humans atrophying muscle away so rapidly, and also building muscle so quickly, is fairly unique to humans so im not sure there has to be a downside to being shredded all the time like a gorilla through some sort of medical treatment in the future. We certainly haven't figured that out now, but I wouldn't be surprised if some gene therapy and chemical cocktail couldn't allow it safely someday. From everything ive seen it seems to be just a calorie saving adaptation so more energy can go to the brain. And perhaps make more varied and specialized living strategies, made possible thanks to our brain, more efficient by not supporting large muscle groups we don't always need.

Of course maybe its not possible, but it is the default for pretty much every other animal so its not like it is trying something completely outrageous like trying to eliminate sleep.