I’ve seen so many people doing mtf hormone treatment go from nearly NW7 to full head of hair.The AR is not responsible for keeping them dormant. Castration after the onset of balding halts its progression but does not reverse it. The PRLR might be responsible for keeping stem cells dormant. It would be a possible explanation for why hair loss usually happens around age 40 when testosterone declines and prolactin increases, although DHT stays the same and I don't know about scalp dht/prl.