Rant about parenting...

Why do people say parenting is so so hard then have another? I don't get it. Bringing a human into this world is meant to be beautiful and the best thing ever. Obviously NOTHING in this world that is worth it is easy and everyones situation is different but why complain if you know what to expect? Exception to children with special needs etc. I'm having a child as I know I will regret not having one and want to experience these magical moments as a little family but I know if it really is that bad I will be sticking with one.