If you cannot guarantee your prospective offspring(s) with the fact that they won't suffer, be afflicted with illness, sadness, existential dread and injuries then you shouldn't be having kids in the first place.
No one should have children, then, because there is no guarantee. My wife’s co-worker and her husband are both perfectly healthy, intelligent, and attractive. Their first child is also perfectly healthy, intelligent, and attractive. Their second child was born with a congenital disease and will never be able to lead a normal life.
And yes, a really short couple will most probably have a short child. But even a tall couple can, in rare cases, have a short child. Although my wife is not short, she’s significantly shorter than her mom even though her dad is close to 200 cm (and yes, it’s her real dad because she looks very much like him), most probably because her grandmother is really short. Again, there’s no guarantee.
Plus, even if your child ends up short, he/she can still have a great life. Of course, you can’t assume that your child is going to become a pop star, but do you think that Bruno Mars or Ariana Grande would rather not exist? On the other hand, there are people whose life seems perfect but who are still depressed (e.g., Chris Cornell). Again, there’s just no guarantee.
The only reason people reproduce is because of tradition and also because it feels good to fŭck
When I was suffering from hypogonadism in my late teens, one doctor told me I might not be able to have children. At that time, I didn’t give a damn because, like you, I didn’t understand why someone would want to reproduce in the first place. Fortunately, that doctor was wrong, and everything went back to normal a few years later. Nowadays, I can say that being a father and watching my child grow up is the most beautiful thing in the world, and I’d rather be 150 cm than no longer be able to see my child smile at me when I wake up in the morning. So it’s not always all about tradition or the fact that it feels good to have sxx (which also feels good if your partner is on birth control).
(Just my two cents, I’m not looking to start another fight with you.)