I can think of only one thing (but I'm fairly small-minded and don't think outside the box). I will use a real-life scenario.  My daughter hit puberty quite early (too early), despite my very purposeful purchase of organic products (especially milk and meats) to prevent growth hormones, outside of mother nature, finding their way into her body.  So when she hit puberty early, I had read that she had about 1-1/2 years from that moment on for her body to finish growing. At that rate, she would be a very short person. My husband, in his youth, had to take growth hormones because he also stopped growing at a very early age. So I took her to a doctor to get an opinion on whether to let nature run it's course, or intervene. He told me about puberty blockers but advised against using it in her case. He studied the growth plates in an x-ray of her hand and determined that, based on the size of those plates, she would continue growing and would be 5'5" when she was done growing (which is one inch taller than me). Had he advised to go with the puberty blocker, we would have let it be HER choice, not ours. God made her the way she is - who are we to go against that?  Anyway, that's the only thing I am aware of as a purpose of puberty blockers.