As opposed to the human body controlling muscle growth from within?
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To answer the questions as asked:
They don’t. Muscle growth is observed from supplementary testosterone alone. Certain animals also preferentially build muscle tissue over fatty tissues with minimal stimulus.
But it’s not much and mechanical stimulus is needed to see significant growth in humans. Best guess anyone has is that the human body is extraordinarily good at doing the bare minimum to stay alive. Most of our functions are use it or lose it. Dexterity, cognition, recall, stimulus tolerance, strength and flexibility.
If you have not presented a convincing reason to build muscle mass your body is going to just chill.
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