Here's why:
* Shaving only cuts the hair at the surface of the skin. It doesn't affect the hair follicle beneath the skin, which is responsible for hair growth.
* The appearance of thicker hair is due to the blunt end of the shaved hair. When hair grows out naturally, it has a tapered tip. When shaved, the blunt end feels coarser as it emerges.
* The perception of darker hair can be because the shaved hair hasn't been exposed to the sun or elements. Natural hair gets lighter over time.
* Hair growth rate is determined by genetics and hormones, not by shaving.
In summary, shaving only alters the texture and appearance of the hair shaft that you can see. It has no impact on the follicle's ability to grow hair.